Lably
Skip to contentA
- A History of the Birds of EuropeNine-volume, late 19th century book about the history of European birds
- AalenianFirst age of the Middle Jurassic
- AardwolfSpecies of insectivorous African mammal
- AbaloneCommon name for a group of sea snails
- Abberton ReservoirReservoir in the United Kingdom
- Abbott's boobySpecies of bird
- Abdopus aculeatusAbdopus aculeatus is a small species of octopus in the order Octopoda. It has the common n
- AbelisauridaeExtinct family of dinosaurs
- AbelisauroideaAbelisauroidea is a diverse superfamily of ceratosaurian dinosaurs, typically regarded as
- Aberdeen AngusScottish breed of beef cattle
- Abnormal behaviour of birds in captivityAbnormal behavior of birds in captivity has been found to occur among both domesticated an
- Abraham Dee BartlettAbraham Dee Bartlett (27 October 1812 – 7 May 1897) was a British taxidermist and an exper
- AbudefdufAbudefduf, also known as the sergeant-majors, is a genus of fish in the family Pomacentrid
- Abyssinian catBreed of domestic cat
- Abyssinian catbirdSpecies of bird
- Acadian flycatcherThe Acadian flycatcher (Empidonax virescens) is a small insect-eating bird of the tyrant f
- AcallosuchusAcallosuchus (meaning "ugly crocodile" in Greek) is an extinct genus of reptile from the T
- AcanthaspisAcanthaspis Amyot & Serville, 1843, is a genus of assassin bugs. Members of the genus are
- Acanthaspis quinquespinosaSpecies of assassin bug
- AcanthasterAcanthaster is a bitypic genus of large and venomous starfish placed in its own family, Ac
- AcanthizaGenus of birds
- AcanthizidaeFamily of birds
- AcanthocephalaGroup of parasitic thorny-headed worms
- Acanthocephala terminalisSpecies of true bug
- AcanthocephaliniAcanthocephalini is a tribe of leaf-footed bugs in the family Coreidae. There are at least
- AcanthophisAcanthophis is a genus of elapid snakes. Commonly called death adders, they are native to
- AcanthopholisAcanthopholis (; meaning "spiny scales") is a genus of ankylosaurian dinosaur in the famil
- AcanthosomaGenus of true bugs
- AcanthostegaExtinct genus of tetrapodomorphs
- AcanthuridaeFamily of fishes with caudal spines
- AcanthuriformesOrder of ray-finned fishes
- AcaridaeThe Acaridae are a family of mites in order Sarcoptiformes.
- AcariformesSuperorder of mite
- AccentorGenus of birds
- AccipitridaeFamily of birds of prey
- AccipitriformesOrder of birds
- AccipitrinaeSubfamily of birds
- AcerentomidaeThe Acerentomidae are a family of hexapods in the order Protura. Acerentomids are not trac
- Acetabular notchThe acetabular notch is a deep notch in the inferior portion of the rim of the acetabulum.
- AchatinaGenus of gastropods
- AchelataThe Achelata is an infra-order of the decapod crustaceans, holding the spiny lobsters, sli
- Acherontia lachesisSpecies of moth
- Achille ValenciennesFrench zoologist, ichthyologist, and malacologist
- AciculopodaAciculopoda is an extinct prawn which existed in what is now Oklahoma approximately 360 mi
- AclopinaeAclopinae is a subfamily of Scarabaeidae or scarab beetles in the superfamily Scarabaeoide
- AcoelaOrder of flatworm-like bilaterian animals
- AcoelomorphaPhylum of marine, flatworm-like animals
- AcontiasAcontias is a genus of limbless skinks, the lance skinks, (family Scincidae) in the Africa
- AcontiinaeAcontiinae is a subfamily of bird dropping moths in the family Noctuidae. There are more t
- Acorn wormClass of hemichordate invertebrates
- AcridotheresGenus of birds
- AcrocephalidaeFamily of birds
- Acrocephalus (bird)Genus of birds
- AcrotretidaAcrotretides (Acrotretida) are an extinct order of linguliform brachiopods in the class Li
- ActenoidesGenus of birds
- Actinopyga capillataSpecies of sea cucumber
- Actinote zikaniCritically endangered species of butterfly
- ActiocyonActiocyon was an extinct genus of ailurid that existed from the Middle Miocene of North Am
- ActitisGenus of birds
- ActophilornisActophilornis is a genus of jacana. It contains two species restricted to Africa and its s
- AcutiramusAcutiramus is a genus of giant predatory eurypterid, an extinct group of aquatic arthropod
- Adam White (zoologist)Adam White (29 April 1817 – 30 December 1878) was a Scottish zoologist.
- AddaxSpecies of antelope native to the Sahara
- Addax TeamAddax, or Barwa Addax was a Spanish motorsport team owned by the bank Addax Capital, which
- AdelobasileusAdelobasileus is a genus of mammaliamorph cynodonts from the Late Triassic (Carnian to Rha
- AdelospondyliAdelospondyli is an order of elongated, presumably aquatic, Carboniferous amphibians (sens
- AdelphobatesAdelphobates is a small genus of poison dart frogs. They are found in the central and lowe
- Adenanthos cuneatusAdenanthos cuneatus, also known as coastal jugflower, flame bush, bridle bush and sweat bu
- Adenostoma fasciculatumAdenostoma fasciculatum, commonly known as chamise or greasewood, is a flowering plant nat
- AdephagaSuborder of beetles
- AderusAderus is a genus of leaf beetles of the family Aderidae that resemble ants. The genus was
- AdianthidaeAdianthidae is an extinct family of litopterns that existed from the Middle Eocene (Muster
- AdrianichthysAdrianichthys is a genus of ricefishes. The genus is endemic to Lake Poso in Sulawesi, Ind
- AdzebillExtinct genus of birds
- AechmophorusGenus of birds
- AedesGenus of mosquitoes
- Aedes aegyptiSpecies of mosquito
- AegeridaeAegeridae is a family of fossil prawns, one of the earliest Mesozoic shrimp families. It c
- AegirocassisinaeAegirocassisinae is a subfamily of radiodonts (marine stem-arthropods) from the lower Pale
- AegithalidaeFamily of birds
- AegithalosGenus of birds
- AegoliusGenus of birds
- AegypiinaeSubfamily of birds
- AegypiusGenus of birds
- Aegypius (mythology)In Greek mythology, Aegypius (Ancient Greek: Αἰγυπιός) was a Thessalian son of Antheus (so
- AegyptosuchusAegyptosuchus ("Egyptian crocodile") is an extinct monospecific genus of aegyptosuchid eus
- AenictusAenictus is a large army ant genus distributed in the Old World tropics and subtropics. It
- AeolosomaGenus of annelids
- AeolothripidaeThe Aeolothripidae are a family of thrips. They are particularly common in the holarctic r
- AepycamelusExtinct genus of mammals
- AepyornisExtinct genus of birds
- AequoreaAequorea is a genus of pelagic hydrozoans in the family Aequoreidae.
- Aequorea victoriaSpecies of hydrozoan
- AequoreidaeFamily of hydrozoans
- AequorlitornithesTaxon of birds
- AequornithesClade of birds
- AerodramusGenus of birds
- AerospizaGenus of birds
- AeshnaAeshna, or the mosaic darners, is a genus of dragonflies from the family Aeshnidae. Specie
- AethiaGenus of birds
- AethomyiasGenus of birds in the family Acanthizidae
- AethomysAethomys is a genus of rodent from Africa. They are commonly referred to as rock rats, bus
- AethopygaGenus of birds
- AetomylaeusAetomylaeus is a genus of eagle rays in the family Myliobatidae.
- AetosauriaExtinct order of heavily armoured reptiles
- AetosauroidesAetosauroides (meaning "Aetosaurus-like") is an extinct genus of aetosaur from the Late Tr
- African black swiftThe African black swift (Apus barbatus), also known as the African swift or black swift, i
- African bullfrogSpecies of frog
- African bush elephantSpecies of mammal
- African civetSpecies of carnivore
- African crakeThe African crake (Crecopsis egregia) is a small- to medium-size ground-living bird in the
- African dwarf kingfisherThis article discusses the African dwarf kingfisher, which is distinct from the Oriental d
- African elephantGenus comprising two living elephant species
- African emerald cuckooThe African emerald cuckoo (Chrysococcyx cupreus) is a species of cuckoo that is native to
- African finfootThe African finfoot (Podica senegalensis) is an aquatic bird from the family Heliornithida
- African forest elephantAfrican elephant species
- African golden catSmall wild cat
- African hill babblerSpecies of bird
- African leopardLeopard subspecies
- African migratory locustLocusta migratoria migratorioides, commonly known as the African migratory locust, is a su
- African palm civetSpecies of carnivore
- African penguinSpecies of bird
- African pygmy kingfisherThe African pygmy kingfisher (Ispidina picta) is a small insectivorous kingfisher found in
- African sacred ibisSpecies of bird
- African shrike-flycatcherSpecies of bird
- African silverbillThe African silverbill (Euodice cantans) is a small passerine bird formerly considered con
- African skimmerThe African skimmer (Rynchops flavirostris) is a species of bird belonging to the skimmer
- African spurred tortoiseSpecies of tortoise
- African wild assSpecies of wild ass
- African wild dogSpecies of canine
- African wildcatSmall wild cat
- African wolfSpecies of canine native to Africa
- AfromontaneThe Afromontane regions are subregions of the Afrotropical realm, one of the Earth's eight
- AfrosoricidaOrder of mammals
- AfrotapejaraAfrotapejara (meaning "African old being") is an extinct genus of tapejarid pterosaur disc
- AfrotheriaSuperorder of mammals containing elephants and elephant shrews
- Afrotropical realmOne of Earth's eight biogeographic realms
- Agabus (beetle)Genus of beetles
- Agabus arcticusAgabus arcticus is a species of predaceous diving beetle in the family Dytiscidae. It is f
- Agabus congenerAgabus congener is a species of predatory beetle native to the Palearctic (including Europ
- Agabus sturmiiAgabus sturmii is a species of beetle native to the Palearctic (including Europe) and the
- AgalychnisGenus of amphibians
- Agami heronSpecies of bird
- AgamidaeFamily of lizards
- AgaonidaeFamily of wasps
- AgaristinaeAgaristinae is one of the larger subfamilies of moths in the family Noctuidae. The subfami
- Agelaia pallipesSpecies of wasp
- AgelasticusGenus of birds
- AgelenidaeFamily of spiders
- ÅgestasjönÅgestasjön (Swedish for "Lake of Ågesta") is a small lake in Huddinge Municipality south o
- AggiosaurusAggiosaurus is an extinct genus of geosaurine metriorhynchid crocodyliform known from the
- AglajidaeAglajidae is a family of often colorful, medium-sized, sea slugs, marine opisthobranch gas
- AgnosphitysAgnosphitys (; "unknown begetter"; sometimes mistakenly called Agnostiphys or Agnosphytis)
- Agonistic behaviourAny social behaviour related to fighting
- AgoutiGenus of mammals
- Agouti (coloration)Animal fur with multiple color bands on each hair
- Agouti coloration geneticsGene responsible for color variations in many species
- Agouti-signaling proteinAgouti-signaling protein is a protein that in humans is encoded by the ASIP gene. It is re
- Agreement on the Conservation of African-Eurasian Migratory WaterbirdsInternational treaty for bird conservation
- Agreement on the Conservation of Albatrosses and Petrels2001 international agreement
- AgudotheriumAgudotherium is an extinct genus of probainognathian cynodonts from the Late Triassic Cand
- AgyrtidaeFamily of beetles
- AhaetullaGenus of snakes
- AiluridaeFamily of carnivores
- AiluroedusGenus of birds
- Air bladder effectAn air bladder effect, or simply a bladder effect, is a special effect created for motion
- Aix (bird)Genus of birds
- AkalatGenus of birds
- AlaemonGenus of birds
- AlalcomenaeusAlalcomenaeus is one of the most widespread and longest-surviving arthropod genera of the
- Alarm signal (animal communication)Signal made by social animals to warn others of danger
- Alaska Peninsula brown bearThe Alaska Peninsula brown bear (Ursus arctos gyas) or "peninsular grizzly" is a colloquia
- AlaudaGenus of birds
- AlaudalaGenus of birds
- AlbertonykusAlbertonykus (meaning "Alberta claw") is an alvarezsaurid dinosaur from the Maastrichtian-
- AlbisaurusAlbisaurus (meaning "Albis [River] lizard") was once thought to be a genus of dinosaur, bu
- AlcedoGenus of birds
- AlcelaphinaeSubfamily of mammals
- Alcippe (bird)Genus of birds
- AlcmonavisExtinct genus of dinosaurs
- AlcyonaceaOrder of octocorals that do not produce massive calcium carbonate skeletons
- AlcyoniidaeAlcyoniidae is a family of leathery or soft corals in the phylum Cnidaria.
- AlcyoniumAlcyonium is a genus of soft corals in the family Alcyoniidae and class octocorallia. Alcy
- Alcyonium digitatumSpecies of soft coral also known as dead man's fingers
- Aldabra giant tortoiseSpecies of tortoise
- AldabrachelysAldabrachelys is genus of giant tortoises, including the Aldabra giant tortoise (Aldabrach
- AlderflyAlderflies are megalopteran insects of the family Sialidae. They are closely related to th
- AlectorisGenus of birds
- AleocharinaeThe Aleocharinae are one of the largest subfamilies of rove beetles, containing over 12,00
- Alethe (genus)Alethe is a genus of small mainly insectivorous birds in the Old World flycatcher family M
- AleurocanthusAleurocanthus is a genus of whiteflies in the family Aleyrodidae.
- Aleurocanthus woglumiCitrus pest from India, now worldwide
- Alexander CollieDr Alexander Collie (2 June 1793 – 8 November 1835) was a Scottish surgeon and botanist wh
- Alexander CoosemansAlexander Coosemans (1627, in Antwerp – 1689, in Antwerp) was a Flemish Baroque painter sp
- Alexander KellnerAlexander Wilhelm Armin Kellner (born September 26, 1961) is a Brazilian geologist and pal
- Alexander RaikhelAlexander S. Raikhel is a distinguished professor of entomology at the University of Calif
- Alexander SkutchAlexander Frank Skutch (May 20, 1904 – May 12, 2004) was a naturalist and writer. He publi
- Alfred Nicholson LeedsAlfred Nicholson Leeds (9 March 1847 – 25 August 1917) was an English amateur palaeontolog
- Alfred William AlcockAlfred William Alcock CIE FRS (23 June 1859 in Bombay – 24 March 1933 in Belvedere, Kent)
- AlisterusGenus of birds
- AllocapniaAllocapnia is a genus of small winter stoneflies in the family Capniidae. There are at lea
- AllokotosauriaAllokotosauria is a clade of early archosauromorph reptiles from the Middle to Late Triass
- AllomerusAllomerus is a Neotropical genus of small ants in the subfamily Myrmicinae. Its eight spec
- AllomotheringInfant care not performed by the mother
- AlopecocyonAlopecocyon is a fossil genus of ailurid belonging to the subfamily Simocyoninae. It has t
- AlophoixusGenus of birds
- AlosaGenus of fishes
- AlpheidaeFamily of crustacean possessing asymmetrical snapping claws
- AlpheoideaAlpheoidea is a superfamily of shrimp. Species of shrimp in the superfamily Alpheoidea are
- Alpheus digitalisAlpheus digitalis is a species of pistol shrimp in the family Alpheidae. The species was f
- Alpheus HyattAlpheus Hyatt (April 5, 1838 – January 15, 1902) was an American zoologist and palaeontolo
- Alpheus Spring PackardAlpheus Spring Packard Jr. LL.D. (February 19, 1839 – February 14, 1905) was an American e
- AlphitobiusAlphitobius is a genus of darkling beetles in the family Tenebrionidae. There are about 18
- Alphitobius diaperinusSpecies of beetle
- Alpine (American goat breed)North American breed of goat
- Alpine ibexSpecies of mammal
- Altitudinal migrationMovement of animals to different altitudes
- AltungulataClade of mammals
- AlvarezsauridaeFamily of extinct long-legged dinosaurs
- Alvinella pompejanaSpecies of annelid
- AlytidaeFamily of amphibians
- AmadinaGenus of birds
- AmarelaPortuguese breed of chicken
- AmargasaurusDicraeosaurid sauropod dinosaur genus from the Early Cretaceous period
- AmaurornisGenus of birds
- AmaurospizaGenus of birds
- AmaziliaGenus of birds
- Amazon basinMajor drainage basin in South America
- Amazon biomeEcological region of South America
- Amazon parrotGenus of birds
- Amazon river dolphinSpecies of toothed whale
- Amazônia LegalSocio-geographic division in Brazil
- Amazonian barred woodcreeperThe Amazonian barred woodcreeper (Dendrocolaptes certhia) is a sub-oscine passerine bird i
- Amazonian umbrellabirdThe Amazonian umbrellabird (Cephalopterus ornatus) is a species of bird in the family Coti
- AmblyornisGenus of birds
- AmblypygiOrder of arachnids
- AmblysomusAmblysomus (also narrow-headed golden mole or South African golden mole) is a genus of the
- Ambondro mahaboAmbondro mahabo is a mammal from the Middle Jurassic (Bathonian) Isalo III Formation (abou
- Ambrosia beetleSpecies of beetle
- AmbulacrariaClade of deuterostomes containing echinoderms and hemichordates
- AmbulocetusGenus of extinct mammals
- AmeeregaAmeerega is a genus of poison dart frogs in the family Dendrobatidae. These frogs live aro
- American alligatorCrocodilian native to the Southeastern United States
- American Anti-Vivisection SocietyPennsylvania-based organization
- American badgerNorth American badger species
- American Birding AssociationAmateur ornithological association
- American bitternThe American bittern (Botaurus lentiginosus) is a species of wading bird in the heron fami
- American black bearSpecies of bear
- American cockroachSpecies of cockroach
- American crowSpecies of passerine bird
- American goldfinchSpecies of bird
- American green kingfisherGenus of birds
- American lionExtinct species of carnivore
- American lobsterLobster of the western North Atlantic
- American martenSpecies of North American mammal
- American Miniature HorseThe American Miniature Horse is an American breed of small or miniature horse. It has been
- American minkSemiaquatic species of mustelid
- American Ornithological SocietySociety of professional ornithologists
- American pickerelSpecies of fish
- American pikaSpecies of mammal
- American Poultry Association
- American RambouilletAmerican breed of sheep
- American red squirrelSpecies of pine squirrel found in North America
- American rosefinchGenus of birds
- American ShorthairBreed of cat
- American Society of MammalogistsAmerican nonprofit organization
- American soleThe American soles are a family (Achiridae) of flatfish occurring in both freshwater and m
- American toadThe American toad (Anaxyrus americanus) is a common species of toad found throughout Canad
- American white ibisThe American white ibis (Eudocimus albus) is a species of bird in the ibis family, Threski
- Amethyst sunbirdThe amethyst sunbird, also called the black sunbird (Chalcomitra amethystina), is a specie
- Amethyst woodstarSpecies of hummingbird
- AmiskwiaGenus of extinct, gnathiferan worms
- Amitus hesperidumSpecies of wasp
- AmmodileThe ammodile, walo or Somali gerbil (Ammodillus imbellis) is a species of rodent in the fa
- AmmodramusGenus of birds
- AmmonoideaExtinct subclass of cephalopod molluscs
- AmmoperdixAmmoperdix is a small genus in the pheasant family Phasianidae of the order Galliformes.
- AmmophilinaeAmmophilinae is a subfamily of thread-waisted wasps in the family Sphecidae. There are abo
- AmnioteClade of tetrapods
- AmpheristusAmpheristus is an extinct genus of prehistoric marine ray-finned fish. It was a basal or s
- AmphibolurinaeThe Amphibolurinae are a subfamily of lizards in the family Agamidae. Members of this subf
- AmphictisAmphictis is an extinct genus of ailurid that existed from the Late Oligocene to the Middl
- AmphicyonExtinct genus of carnivores
- AmphicyonidaeExtinct family of carnivores
- AmphidiniumAmphidinium is a genus of dinoflagellates. The type for the genus is Amphidinium operculat
- AmphilestidaeAmphilestidae is a family of Mesozoic mammals, generally regarded as eutriconodonts. They
- Amphioctopus marginatusSpecies of cephalopod
- AmphipodaOrder of malacostracan crustaceans
- AmphipyrinaeAmphipyrinae is a subfamily of owlet moths in the family Noctuidae. There are more than 50
- AmphisbaeniaClade of reptiles
- AmphizoaGenus of beetles
- AmplectobeluidaeAmplectobeluidae is a clade of Cambrian radiodonts. It currently includes five definitive
- Ampullae of LorenziniSensory organs in some fish that detect electrical fields
- Amsacta moloneyiSpecies of moth
- AnachronornisAnachronornis is a genus of extinct bird from the Late Paleocene (Thanetian) of North Amer
- AnacondaGenus of snakes
- AnairetesGenus of birds
- Anal glandGlands found near the anus in many mammals
- Analamazaotra National ParkAnalamazaotra National Park is a national park of Madagascar. The park is in the eastern p
- AnasGenus of birds
- AnaspidaGroup of extinct jawless vertebrates
- Anastrepha ludensAnastrepha ludens, the Mexican fruit fly or Mexfly, is a species of fly of the Anastrepha
- AnatalavisExtinct genus of birds
- AnatidaeBiological family of water birds
- AnatinaeSubfamily of birds
- AnautogenyParasitic insect reproductive strategy
- AnchiornisExtinct genus of dinosaurs
- Ancient murreletThe ancient murrelet (Synthliboramphus antiquus) is a bird in the auk family. The English
- Ancistrocerus antilopeAncistrocerus antilope is a species of wasp of the family Vespidae.
- AncistronychusAncistronychus is an extinct genus of drepanosaur from the Late Triassic Petrified Forest
- AncodontaAncodonta is an infraorder of artiodactyl ungulates including modern hippopotamus and all
- AncylostomaGenus of roundworms
- Ancylostoma brazilienseAncylostoma braziliense is a species of hookworm belonging to the genus Ancylostoma. It is
- Ancylostoma ceylanicumAncylostoma ceylanicum is a parasitic roundworm belonging to the genus Ancylostoma. It is
- Ancylostoma tubaeformeAncylostoma tubaeforme is a hookworm that infects cats worldwide. Infection can occur thro
- AncyronyxGenus of beetles
- Andean cock-of-the-rockSpecies of bird
- Andean condorSpecies of bird
- Andean cootThe Andean coot (Fulica ardesiaca), also known as the slate-colored coot, is a species of
- Andean flamingoThe Andean flamingo (Phoenicoparrus andinus) is a species of flamingo native to the Andes
- Andean hillstarThe Andean hillstar (Oreotrochilus estella) is a species of hummingbird in the "coquettes"
- André PeyriérasDr André Peyriéras (December 11, 1927, in Saint Moreil (Le Monthioux), France – December 2
- AndrenaGenus of bees
- AndrenidaeFamily of bees
- AndrewsarchusExtinct genus of carnivorous ungulate from Eocene epoch
- AnelosimusAnelosimus is a cosmopolitan genus of cobweb spiders (Theridiidae), currently containing 7
- AneuretinaeAneuretinae is a subfamily of ants consisting of a single extant species, Aneuretus simoni
- AneuretopsychidaeAneuretopsychidae is an extinct family of scorpionflies known from the Mesozoic. Fossils a
- Angeac-Charente bonebedThe Angeac-Charente bonebed is a fossil deposit located near Angeac-Charente in western Fr
- AngelsharkGenus of sharks
- Angora goatTurkish breed of goat
- Angora rabbitFamily of rabbit breeds
- AnguimorphaSuborder of lizards
- AnguinaeSubfamily of reptiles
- Ani (bird)Genus of birds
- AniksosaurusAniksosaurus (meaning "spring lizard", from Modern Greek Άνοιξη, "Spring", referring to th
- Animal behaviourAnimal behaviour is the individual or social behaviour of animals, contributing to their s
- Animal communicationTransfer of information from animal to animal
- Animal control serviceEntity charged with responding to requests for help with animals
- Animal echolocationMethod used by several animal species to determine location using sound
- Animal euthanasiaVeterinary procedure
- Animal genetic resources for food and agricultureAnimal genetic resources for food and agriculture (AnGR), also known as farm animal geneti
- Animal latrineDedicated site where wild animals urinate and defecate
- Animal locomotion on the water surfaceAnimal locomotion on the surface layer of water is the study of animal locomotion in the c
- Animal migration trackingUsed to study animals' behavior in the wild
- Animal nutritionScience of nutrition for animals
- Animal sacrificeRitual
- Animal showAn animal show is a form of exhibition featuring the display or performance of one or more
- Animal songComplex sounds made by animals
- Animal studiesCross-disciplinary study of animals
- Animal trainingTeaching animals specific responses to specific conditions or stimuli
- Animal welfare scienceStudy of the welfare of animals
- Animal worshipGlorification of animal deities
- Animals in the BibleOver 120 species of animals are mentioned in the Bible, ordered alphabetically in this art
- Animals in video gamesThe depiction of animals in video games has echoed the wider symbolism of animals in cultu
- Anisakis simplexSpecies of parasitic nematode
- AnisembiidaeAnisembiidae is a family of insects in the order Embioptera, the web-spinners. The family
- AnisognathusGenus of birds
- AnisopodidaeThe Anisopodidae are a small cosmopolitan family of gnat-like flies known as wood gnats or
- Anjajavy ForestThe Anjajavy's Protected Area is located on a peninsula of the town of Antonibe, in the di
- Anjanaharibe-Sud Special ReserveAnjanaharibe-Sud Special Reserve is a wildlife reserve in the north-east of Madagascar. Th
- AnkylosauriaExtinct order of dinosaurs
- AnkylosaurusAnkylosaurid dinosaur genus from the Late Cretaceous Period
- AnkylosuchusAnkylosuchus is an extinct doswelliid archosauromorph reptile from the Late Triassic of Te
- AnkyramorphaAnkyramorpha ("anchor forms") is an extinct clade of procolophonomorph parareptiles which
- Ann W. Richards Congress Avenue BridgeBridge in Austin, Texas
- Anna's hummingbirdSpecies of bird
- AnnulipalpiaThe Annulipalpia, also known as the "fixed-retreat makers", are a suborder of Trichoptera,
- AnodorhynchusGenus of birds
- AnolidaeFamily of reptiles
- Anomala orientalisSpecies of beetle
- AnomalepididaeThe Anomalepididae are a family of nonvenomous snakes, native to Central and South America
- AnomalipesAnomalipes zhaoi (meaning "Zhao Xijin's unusual foot") is an extinct caenagnathid dinosaur
- AnomalocarididaeAnomalocarididae (occasionally mis-spelt Anomalocaridae) is an extinct family of Cambrian
- AnomalocarisExtinct genus of Cambrian radiodont
- AnomalopidaeFamily of bioluminescent fish
- AnomodontiaAnomodontia is an extinct group of non-mammalian therapsids from the Permian and Triassic
- AnomuraInfraorder of crustaceans
- AnophelesGenus of mosquito
- Anopheles arabiensisAnopheles arabiensis is a zoophilic species of mosquito and a vector of disease endemic to
- Anopheles gambiaeSpecies complex of mosquitos
- AnoplolepisAnoplolepis, also known as the "pugnacious ants", is a genus of ants in the subfamily Form
- Anoplolepis custodiensSpecies of ant
- AnoplosaurusAnoplosaurus (meaning "unarmored or unarmed lizard") is an extinct genus of herbivorous no
- AnoplotheriidaeExtinct family of artiodactyls
- AnoplotheriumExtinct genus of endemic Paleogene European artiodactyls
- Anser (bird)Genus of birds
- AnseranatidaeAnseranatidae, the magpie-geese, is a biological family of waterbirds. The only living spe
- AnseriformesOrder of water birds
- Ansons BayAnsons Bay is a rural locality in the local government area (LGA) of Break O'Day in the No
- Ant followerType of bird
- Ant nest beetleSubfamily of beetles
- Antarctic fishesCommon name for several species of fish
- Antarctic petrelSpecies of bird
- Antarctic toothfishSpecies of fish
- AntedonGenus of crinoids
- Antedon mediterraneaSpecies of crinoid
- AntedonidaeAntedonidae is a family of crinoids or feather stars in the phylum Echinodermata. Members
- Antelope jackrabbitSpecies of mammal
- Anthias anthiasSpecies of ray-finned fish
- AnthoathecataAnthoathecata, or the athecate hydroids, are an order of hydrozoans belonging to the phylu
- AnthochaeraGenus of birds
- Anthodon (reptile)Anthodon (meaning "flower tooth") is an extinct genus of pareiasaur parareptile from the P
- AnthonomusAnthonomus is a genus of weevils. This genus includes major agricultural pests such as the
- Anthony Adrian AllenBritish entomologist
- AnthoscopusGenus of birds
- AnthozoaSubphylum of cnidarians without a medusa stage
- AnthracinaeAnthracinae is a subfamily of bee flies in the family Bombyliidae. There are more than 80
- AnthracocerosGenus of birds
- AnthracomartidaeAnthracomartidae, first described by Haase, 1890, is a family of the extinct arachnid orde
- AnthracotheriidaeExtinct family of mammals
- AnthracotheriinaeThe anthracotheriines are an extinct subfamily of anthracotheres that comprised Paleogene
- AnthracotheriumExtinct genus of mammals
- AnthracothoraxGenus of birds
- Anthrenus flavipesSpecies of beetle
- AnthreptesGenus of birds
- AnthropopithecusThe terms Anthropopithecus (Blainville, 1839) and Pithecanthropus (Haeckel, 1868) are obso
- AnthrozoologySubset of ethnobiology
- Anti-predator adaptationDefensive feature of prey for selective advantage
- Antigone (bird)Genus of birds
- Antillean piculetSpecies of woodpecker
- AntilocapridaeFamily of mammals belonging to even-toed ungulates
- Anting (behavior)Avian maintenance behavior
- AntlionFamily of insects
- AntpittaFamily of birds
- AntrostomusGenus of birds
- AntrozoiniAntrozoini is a tribe of bats in the subfamily Vespertilioninae of the family Vespertilion
- AnurognathidaeFamily of pterosaurs from the Jurassic and Cretaceous periods
- ApalisGenus of birds
- Apantesis argeApantesis arge, the arge moth or arge tiger moth, is a moth of the family Erebidae. The sp
- ApatoraptorApatoraptor (meaning "deceptive thief") is a genus of caenagnathid dinosaur which contains
- ApatosaurusSauropod dinosaur genus from Late Jurassic period
- Aphalara itadoriSpecies of true bug
- AphelinidaeFamily of wasps
- AphelocomaGenus of birds
- AphididaeFamily of true bugs
- AphidomorphaAphidomorpha is an infraorder within the insect order Sternorrhyncha which includes the ap
- AphisGenus of true bugs
- Aphis neriiAphis nerii is an aphid of the family Aphididae. Its common names include oleander aphid,
- AphonopelmaAphonopelma is a genus of tarantulas native to the Americas. It includes nearly all the No
- Aphonopelma chalcodesSpecies of spider
- AphrophoraAphrophora is a genus of spittlebugs in the family Aphrophoridae. There are at least 80 de
- AphrophoridaeFamily of true bugs
- ApidaeFamily of bees
- Apis andreniformisApis andreniformis, or the black dwarf honey bee, is a relatively rare species of honey be
- Apis ceranaSpecies of honey bee
- Apis cerana japonicaSubspecies of bee
- Apis dorsataSpecies of insect
- Apis floreaSpecies of bee
- Apis koschevnikoviApis koschevnikovi, Koschevnikov's honey bee, is a species of honey bee which inhabits Mal
- Apis laboriosaApis laboriosa or Himalayan giant honey bee, is the world's largest honey bee; single adul
- AplacophoraClass of molluscs
- AplonisGenus of birds
- AplysiidaOrder of gastropods
- AplysiidaeAplysiidae is the only family in the superfamily Aplysioidea, within the clade Anaspidea.
- Apocephalus borealisSpecies of fly
- ApocritaSuborder of insects containing wasps, bees, and ants
- ApodiformesOrder of birds
- ApodinaeSubfamily of birds
- Apoica flavissimaSpecies of wasp
- ApolemiaApolemia is a genus of siphonophores. It is the only genus in the monotypic family Apolemi
- Apostatic selectionApostatic selection is a form of negative frequency-dependent selection. It describes the
- ApostlebirdThe apostlebird (Struthidea cinerea), also known as the grey jumper, lousy jack or happy f
- AppaloosaAmerican horse breed noted for spotted color pattern
- Apparent deathAnimals playing dead
- Apple maggotSpecies of fly
- AprasiaAprasia is a genus of lizards in the family Pygopodidae. The genus is endemic to Australia
- AprosmictusGenus of birds
- AptenodytesGenus of birds
- ApteropanorpidaeApteropanorpidae is a family of wingless scorpionflies containing a single genus, Apteropa
- ApterygotaSubclass of insects
- AptianFifth age of the Early Cretaceous
- AquaristAn aquarist is a person who manages aquariums, either professionally or as a hobby. They t
- Aquarium heaterAn aquarium heater is a device used in the fishkeeping hobby to warm the temperature of wa
- Aquatic animalAnimal living mostly or entirely in water
- Aquatic insectInsect that lives in water
- Aquatic mammalMammal that dwells partly or entirely in bodies of water
- Aquatic plant managementAquatic plant management involves the science and methodologies used to control invasive a
- Aquila (bird)Genus of birds
- AquilarhinusAquilarhinus (meaning "eagle snout" after the unusual beak morphology) is a genus of hadro
- AquilinaeSubfamily of birds
- Arabian babblerThe Arabian babbler (Argya squamiceps) is a passerine bird until recently placed in the ge
- Arabian bustardThe Arabian bustard (Ardeotis arabs) is a species of bustard which is found across the Sah
- Arabian oryxSpecies of antelope
- Arabian tahrThe Arabian tahr (Arabitragus jayakari) is a species of tahr native to eastern Arabia. Unt
- Aracá uakariThe Aracá uakari (Cacajao ayresi), also known as the Ayres black uakari, is a newly descri
- AracariGenus of birds
- Arachnocampa luminosaSpecies of fly
- ArachnologyScientific study of arachnids
- AraeodelphisAraeodelphis is an extinct genus of river dolphin from the early Miocene of the East Coast
- Arago caveArago cave is a prehistoric site in the community of Tautavel, in the department of Pyréné
- ArandaspisExtinct genus of Pteraspidomorph fish
- AratingaGenus of birds
- Arbacia lixulaSpecies of sea urchin
- Arbacia punctulataThe Atlantic purple sea urchin (Arbacia punctulata) is a species of sea urchins from the f
- ArborophilaGenus of birds
- ArchaeobatrachiaArchaeobatrachia (Neo-Latin archaeo- ("old") + batrachia ("frog")) is a suborder of the or
- ArchaeocyathaExtinct class of sponges
- ArchaeognathaOrder of wingless insects
- ArchaeopterygidaeFamily of dinosaurs
- ArchaeornithoidesArchaeornithoides is a genus of maniraptoran theropod dinosaur of the Late Cretaceous of M
- ArchaeornithuraExtinct genus of birds
- Archbold's bowerbirdSpecies of bird
- ArchboldomysArchboldomys, the shrew-mice, are a genus of rodents in the family Muridae. They are carni
- ArchedictyonHypothetical scheme of wing venation
- ArchelonCretaceous marine turtle and the largest turtle ever discovered
- ArchelosauriaClade comprising turtles, birds and crocodilians
- ArcherfishFamily of fishes
- Archeria (animal)Archeria is a genus of embolomere which lived in the Early Permian of Texas and Oklahoma.
- Archilochus (bird)Genus of birds
- ArchipelepidiformesArchipelepidiformes is an order of extinct jawless fishes in the class Thelodonti.
- Archispirostreptus gigasSpecies of millipede
- ArchosaurGroup of diapsids broadly classified as reptiles
- ArchosauromorphaClade of reptiles
- ArchostemataSuborder of beetles
- Arctic foxSpecies of fox
- Arctic Owl (horse)Arctic Owl (29 March 1994 – 13 August 2021) was a British Thoroughbred racehorse. A specia
- Arctic ternBird that breeds in the Arctic and subarctic and migrates to the Antarctic
- Arctic wolfSubspecies of carnivore
- ArctodusExtinct genus of bears
- ArctoideaInfraorder of mammals
- Ardea (bird)Genus of birds
- ArdeinaeSubfamily of herons
- ArdennaArdenna is a genus of seabirds in the family Procellariidae. These medium-sized to large s
- ArdiFossilized remains of a human-like hominim
- ArdipithecusExtinct genus of hominins
- Ardipithecus kadabbaHominin fossil
- Ardipithecus ramidusExtinct hominin from Early Pliocene Ethiopia
- ArenicolaGenus of annelids
- ArenicolidaeFamily of annelids
- Arfak astrapiaThe Arfak astrapia (Astrapia nigra) is a species of astrapia, a group of birds found in th
- ArgasidaeThe Argasidae are the family of soft ticks, one of the three families of ticks. The family
- ArgentavisExtinct genus of very large birds
- Argentine antSpecies of ant
- ArgentinosaurusExtinct genus of giant sauropod dinosaur
- ArgiolestidaeArgiolestidae is a family of flat-wing damselflies in the order Odonata. There are at leas
- Argiope catenulataArgiope catenulata, also known as the grass cross spider, is a species of orb-weaver spide
- Argonaut (animal)Genus of cephalopods
- Argonauta hiansArgonauta hians, also known as the winged argonaut, muddy argonaut or brown paper nautilus
- Argonauta nouryiArgonauta nouryi, also known as Noury's argonaut, is a species of pelagic octopus. The fem
- ArgonautidaeThe Argonautidae are a family of pelagic cephalopods that inhabit tropical and temperate o
- ArgulidaeFamily of crustaceans
- ArgulusArgulus is a genus of fish lice in the family Argulidae. There are about 140 accepted spec
- Argus (bird)Clade of bird
- ArgyaGenus of birds in the family Leiothrichidae
- ArgyripnusArgyripnus is an oceanic ray-finned fish genus in the marine hatchetfish family Sternoptyc
- ArielulusArielulus is a genus of vesper bats with the following species:
- ArilusArilus, or wheel bugs due to the semicircular crest on the pronotum, is a genus of true bu
- Arilus cristatusSpecies of true bug
- Arini (tribe)Clade of birds
- ArizelocichlaGenus of birds
- Arizona bark scorpionSpecies of scorpion
- Arizona myotisThe Arizona myotis (Myotis occultus) or southwestern little brown myotis is a vesper bat s
- ArizonasaurusExtinct genus of reptiles
- ArkansaurusArkansaurus (meaning "Arkansas lizard") is an extinct genus of ornithomimosaurian theropod
- ArmadillosuchusArmadillosuchus is an extinct genus of sphagesaurid crocodylomorph. It was described in Fe
- ArmaniinaeExtinct group of insects
- Armenian cochinealSpecies of true bug
- Armored ratThe armored rat (Hoplomys gymnurus) is a species of rodent in the family Echimyidae. It is
- Armour (zoology)Anatomical feature
- Army antName used for several ant species
- ArremonGenus of birds
- ArsinoitheriumExtinct genus of mammals
- ArtamidaeFamily of birds
- Artemia parthenogeneticaArtemia parthenogenetica is a species of brine shrimp – aquatic crustaceans belonging to a
- ArthropleuraExtinct genus of millipedes
- Arthropod eyeVisual organs possessed by arthropods
- Arthropod head problemDispute concerning the evolution of arthropods
- Arthropods in filmArthropods, which include crustaceans, arachnids, and insects, are characterized in many d
- Arthur Hay, 9th Marquess of TweeddaleColonel Arthur Hay, 9th Marquess of Tweeddale, FRS FRSE FZS (9 November 1824 – 29 December
- Arthur Smith WoodwardSir Arthur Smith Woodward, FRS (23 May 1864 – 2 September 1944) was an English palaeontolo
- ArtibeusGenus of bats
- Artibeus schwartziArtibeus schwartzi, or Schwartz's fruit-eating bat, is a species of bat found in the Lesse
- Articulata (Crinoidea)Articulata are a subclass or superorder within the class Crinoidea, including all living c
- Artificial bee colony algorithmAlgorithm in computer science
- ArvicanthisArvicanthis is a genus of rodent from Africa. They are commonly referred to as unstriped g
- ArvicoliniArvicolini is a tribe of voles in the subfamily Arvicolinae.
- AscalaphinaeAscalaphinae is the type subfamily of the neuropteran owlfly family. Most species are foun
- AscarisGenus of roundworms
- Ascaris lumbricoidesOne of several species of Ascaris
- Ascaris suumSpecies of roundworm
- AschizaThe Aschiza are a section of the Brachycera. Two large families, the Syrphidae and the Pho
- AscidiaceaParaphyletic class of tunicates comprising sea squirts
- Asclepias fascicularisAsclepias fascicularis is a species of milkweed known by the common names narrowleaf milkw
- AsellotaAsellota is a suborder of isopod crustaceans found in marine and freshwater environments.
- AshoroaAshoroa (named after its type locality Ashoro, Hokkaido) is an extinct genus of desmostyli
- AsiahesperornisAsiahesperornis is a prehistoric foot-propelled diving toothed flightless bird genus from
- AsiamericanaAsiamericana is a dubious genus of coelurosaur known only from isolated teeth found in the
- Asian black bearSpecies of bear
- Asian elephantSecond-largest species of elephant
- Asian fairy-bluebirdThe Asian fairy-bluebird (Irena puella) is a medium-sized, arboreal passerine bird. This f
- Asian giant hornetPredatory hornet, largest in the world
- Asian golden catSpecies of wild cat
- Asian gray shrewThe Asian gray shrew (Crocidura attenuata) is a species of mammal in the family Soricidae.
- Asian house martinThe Asian house martin (Delichon dasypus) is a migratory passerine bird of the swallow fam
- Asian koelSpecies of bird
- Asian long-horned beetleSpecies of beetle
- Asian palm civetSpecies of mammal
- Asian stubtailThe Asian stubtail (Urosphena squameiceps) is a bird in the family Cettiidae. The species
- Asian thrushGenus of birds
- Asian water monitorSpecies of lizard
- Asiatic cheetahSubspecies of cheetah in Asia
- Asiatic linsangGenus of carnivores
- Asiatic lionLion population in India
- Asiatic salamanderFamily of amphibians
- AsilidaeFamily of flies
- AsiloideaThe Asiloidea comprise a very large superfamily insects in the order Diptera, the true fli
- AsinusSubgenus of mammals
- AsioGenus of birds
- AsityFamily of birds
- Asparagus beetleCrioceris, or asparagus beetle, is a genus of the family Chrysomelidae of beetles. The nam
- AspidellaGenus of Ediacaran animals
- Aspidiotus destructorSpecies of true bug
- AspiditesAspidites is a genus of pythons endemic to Australia. The name can be translated as "shiel
- AspidosiphonidaeAspidosiphonidae is a family of peanut worms. It is the only family in the monotypic order
- Aspirator (entomology)Device used in the collection of small organisms
- Asset of community valueIn England, an asset of community value (ACV) is land or property of importance to a local
- Astacus astacusSpecies of crayfish in Europe
- Asterias amurensisSpecies of starfish
- Asterina (echinoderm)Genus of echinoderms
- Asterina gibbosaAsterina gibbosa, commonly known as the starlet cushion star, is a species of starfish in
- AsterinidaeThe Asterinidae are a large family of sea stars in the order Valvatida.
- AsteriornisFossil bird genus from Belgium
- AsterozoaSubphylum of marine invertebrates
- AstrapiaGenus of birds
- Astur (bird)Genus of birds
- AsylosaurusAsylosaurus (meaning "unharmed or sanctuary lizard") is a genus of basal sauropodomorph di
- Athene (bird)Genus of birds
- AtherigonaGenus of flies
- AthetiniAthetini is a tribe of rove beetles in the family Staphylinidae. There are at least 50 gen
- Atlantic bluefin tunaSpecies of fish
- Atlantic canarySpecies of bird
- Atlantic codSpecies of fish
- Atlantic FlywayMajor north-south flyway for migratory birds in North America
- Atlantic herringSpecies of fish
- Atlantic puffinSpecies of seabird
- Atlantic salmonSpecies of fish
- Atlantic white-sided dolphinSpecies of mammal
- AtlantogenataMagnorder of mammals
- AtlapetesGenus of birds
- Atlas of Australian BirdsThe Atlas of Australian Birds is a major ongoing database project initiated and managed by
- Atlas of Living AustraliaThe Atlas of Living Australia (ALA) is an online repository of information about Australia
- AtopodentatusAtopodentatus is an extinct genus of basal sauropterygian known from the early Middle Tria
- Atta (ant)Genus of ants
- AttagisGenus of birds
- Attalea phalerataAttalea phalerata is a species of palm tree known by the English common name urucuri palm,
- AttelabidaeThe Attelabidae is a widespread family of weevils. They are among the primitive weevils, b
- Attila (bird)Genus of birds
- AtyphellaGenus of beetles
- AudubonAmerican environmental organization
- Auguste PomelNicolas Auguste Pomel (20 September 1821 – 2 August 1898) was a French geologist, paleonto
- AulacephalodonAulacephalodon ("furrow-head tooth") is an extinct genus of medium-sized dicynodonts, or n
- AulostomoideaAulostomoidei is a superfamily of the order Syngnathiformes, which also contains groups su
- Aurelia (cnidarian)Genus of jellyfish
- Aurelia labiataAurelia labiata is a species of moon jellyfish. It is a cnidarian in the family Ulmaridae.
- Aurelia limbataAurelia limbata, the brown-banded moon jelly, is a type of moon jelly that occurs in vario
- Austin Roberts (zoologist)Austin Roberts (3 January 1883 – 5 May 1948) was a South African zoologist. He is best kno
- Austral snipeGenus of birds
- Austral storm petrelFamily of birds
- Australasian figbirdThe Australasian figbird (Sphecotheres vieilloti), also known as the green figbird (not to
- Australasian robinFamily of birds
- Australasian treecreeperFamily of birds
- Australasian wrenFamily of birds
- Australian bat lyssavirusSpecies of virus
- Australian bustardSpecies of bird
- Australian Dung Beetle ProjectScientific research and biological control project
- Australian feral camelFeral camels in Australia
- Australian funnel-web spiderFamily of mygalomorph spiders
- Australian king parrotThe Australian king parrot (Alisterus scapularis) is a species of parrot endemic to easter
- Australian LowlineAustralian breed of cattle
- Australian magpieMedium-sized black and white passerine bird
- Australian mudnesterFamily of birds
- Australian Poultry StandardsThe Australian Poultry Standards is the official breed standard for poultry fancy in Austr
- Australian ringneckSpecies of bird
- Australian swiftletThe Australian swiftlet (Aerodramus terraereginae) is a small bird belonging to the genus
- Australian zebra finchSpecies of bird
- Australo-Papuan babblerFamily of birds
- AustralopithecineExtinct subtribe of the Hominini tribe
- Australopithecus afarensisExtinct hominid from the Pliocene of East Africa
- Australopithecus africanusExtinct hominid from South Africa
- Australopithecus anamensisExtinct hominin from Pliocene East Africa
- Australopithecus bahrelghazaliExtinct species of hominin from 3.5 mya
- Australopithecus deyiremedaProposed extinct species of hominin of Ethiopia from 3.5 to 3.3 mya
- Australopithecus garhiExtinct hominid from the Afar Region of Ethiopia 2.6–2.5 million years ago
- Australopithecus sedibaExtinct hominin from South Africa
- AustralorpAustralian breed of chicken
- AustroargiolestesAustroargiolestes is a genus of damselflies in the family Argiolestidae. They are commonly
- AustroplebeiaAustroplebeia is a stingless bee (Meliponini) genus in the family Apidae. The genus was er
- AutomolusGenus of birds
- AutothysisDefense mechanism in which an animal explodes intentionally
- Available nameProperly constructed taxonomic name
- AvemetatarsaliaClade of bird-like archosaur reptiles
- AvetheropodaAvetheropoda, or "bird theropods", is a clade that includes Carnosaurs and coelurosaurs to
- AvialaeClade including all birds and their ancestors
- Avian brainBrain of birds
- Avian clutch sizeClutch size refers to the number of eggs laid in a single brood by a nesting pair of birds
- Avian ecology field methodsThere are many field methods available for conducting avian ecological research. They can
- Avian infectious bronchitisAvian infectious bronchitis (IB) is an acute and highly contagious respiratory disease of
- Avian palliumIn the neuroanatomy of animals, an avian pallium is the dorsal telencephalon of a bird's b
- Avian range expansionAvian range expansion describes how birds expand their habitat. Because of the activities
- Avian veterinarianVeterinarian that specializes in birds
- AvibaseAvibase is an online taxonomic database that organizes bird taxonomic and distribution dat
- AvicephalaAvicephala ("bird heads") is a potentially polyphyletic grouping of extinct diapsid reptil
- AvicraniumAvicranium is a genus of extinct drepanosaur reptile known from the Chinle Formation of th
- AviculturePractice of keeping and breeding birds
- AvifiloplumaClade including all feathered animals
- AviListAvian checklist
- AvimaiaExtinct genus of birds
- AvipesAvipes (meaning "bird foot") is a genus of extinct archosaurs represented by the single sp
- AvisaurusExtinct genus of birds
- AvocetGenus of birds
- Axel Leonard MelanderAxel Leonard Melander (3 June 1878 – 14 August 1962) was an American entomologist speciali
- AxiideaInfraorder of crustaceans
- Axis (genus)Axis is a genus of deer occurring in South and Southeast Asia. As presently defined by mos
- AxolotlSpecies of salamander
- Aye-ayeSpecies of primate
- AysheaiaExtinct genus of soft-bodied animals
- AythyaGenus of birds
- Azara's night monkeyAzara's night monkey (Aotus azarae), also known as the southern night monkey, is a night m
- AzendohsauridaeAzendohsauridae is a family of allokotosaurian archosauromorphs that lived during the Midd
- AzendohsaurusAzendohsaurus is an extinct genus of herbivorous archosauromorph reptile from roughly the
- AzhdarchidaeFamily of large azhdarchoid pterosaurs
- Aztec thrushSpecies of bird
