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- Sabella (annelid)Genus of annelids
- Sabella spallanzaniiSpecies of annelid worm
- SabellidaeSabellidae, or feather duster worms, are a family of marine polychaete tube worms characte
- Saber-toothed predatorGroup of extinct animals
- SabethesSabethes or canopy mosquitos are primarily an arboreal genus, breeding in plant cavities.
- Sabethes cyaneusSpecies of mosquito
- SableSpecies of marten
- Sabota larkThe sabota lark (Calendulauda sabota) is a species of lark in the family Alaudidae. It is
- SacacosuchusSacacosuchus is an extinct monospecific genus of marine gavialid that lived along the coas
- SacisaurusSacisaurus ("Saci lizard") is a silesaurid dinosauriform from the Late Triassic (Norian) C
- Sacrococcygeal symphysisThe sacrococcygeal symphysis (sacrococcygeal articulation, articulation of the sacrum and
- Saffron toucanetThe saffron toucanet (Pteroglossus bailloni) is a species of bird in the family Ramphastid
- Sagittal crestRidge of bone along the top of a skull
- SahelanthropusExtinct hominid from Miocene Africa
- Saiga antelopeSpecies of antelope
- Saiga semi-automatic rifleThe Saiga semi-automatic rifles (/ˈsaɪɡə/, Saiga) (Russian: сайга, romanized: Sayga) are a
- SailfishGenus of fishes
- Saimaa ringed sealFreshwater seal found in Finland
- Saimiri fieldsiSaimiri fieldsi is an extinct species of New World monkey in the genus Saimiri (squirrel m
- Saint Bathans mammalThe Saint Bathans mammal is a currently unnamed extinct primitive mammal from the Early Mi
- SaissetiaSaissetia is a genus of soft scale insects in the family Coccidae. There are at least four
- Saissetia oleaeSpecies of true bug
- SakaniaSakania is a town in Haut-Katanga Province, in the Congo Pedicle, in the far south of the
- Saki monkeySakis, or saki monkeys, are any of several New World monkeys of the genus Pithecia. They a
- SalamandroideaThe Salamandroidea are a suborder of salamanders, referred to as advanced salamanders. The
- SaldidaeFamily of true bugs
- SalientiaOrder of amphibians
- Salix bebbianaSalix bebbiana is a species of willow indigenous to Canada and the northern United States,
- SalmoniformesOrder of fishes
- SalpFamily of tunicates
- Salt marsh harvest mouseSpecies of rodent
- SaltasauridaeExtinct family of dinosaurs
- SaltopusSaltopus ("hopping foot") is a genus of very small bipedal dinosauriform containing the si
- Saltwater crocodileSpecies of reptile
- Salvin's curassowSalvin's curassow (Mitu salvini) is a species of bird in the family Cracidae, the chachala
- Sambar deerSpecies of deer
- Samea multiplicalisSamea multiplicalis, the salvinia stem-borer moth, is an aquatic moth commonly found in fr
- SamrukiaSamrukia is a genus of large Cretaceous pterosaurs known only from a single lower jaw disc
- Samuel Hubbard ScudderSamuel Hubbard Scudder (April 13, 1837 – May 17, 1911) was an American entomologist and pa
- San Joaquin kit foxSubspecies of mammal
- San Jose scaleSpecies of true bug
- San Pedro Island (Chile)Isla San Pedro is a privately owned island located off the southeastern shore of Chiloé Is
- SanchuansaurusSanchuansaurus is an extinct genus of pareiasaur from the late Permian Sunjiagou Formation
- Sand catSmall wild cat species (Felis margarita)
- Sand dollarOrder of sea urchins
- Sand sharkFamily of sharks
- Sand tiger sharkSpecies of shark
- SandflyName of several types of blood-sucking fly
- SandgrouseFamily of birds
- Sanga cattleBreed of cattle
- SaolaSpecies of mammal
- SapayoaThe sapayoa or broad-billed sapayoa (Sapayoa aenigma) is a suboscine passerine bird found
- SaprininaeSaprininae is a subfamily of clown beetles in the family Histeridae. There are more than 5
- SaproamanitaThe genus Saproamanita contains about 24 species of agarics and is one of six genera in th
- SarcolestesSarcolestes (meaning "flesh robber") is an extinct genus of ankylosaurian ornithischian di
- SarcoptesSarcoptes is a genus of mites.
- SarcoptiformesThe Sarcoptiformes are an order of mites comprising over 15,000 described species in aroun
- SarcosuchusExtinct genus of pholidosaurid crocodylomorph
- SarkidiornisSarkidiornis is a genus within the family Anatidae comprising two species that inhabit aqu
- Sarracenia purpureaSarracenia purpurea, the purple pitcher plant, northern pitcher plant, turtle socks, or si
- Sarus craneSpecies of bird
- Satanic nightjarSpecies of bird
- SatinbirdFamily of birds
- SauriaClade of reptiles
- SaurischiaClade of dinosaurs
- SauroctonusSauroctonus ("lizard killer") is an extinct genus of gorgonopsian therapsids who lived dur
- SauropodomorphaExtinct clade of dinosaurs
- SauropsidaTaxonomic clade
- SaurosternonSaurosternon is an extinct genus of neodiapsid reptile from the Late Permian of South Afri
- Savanna gliderThe savanna glider (Petaurus ariel) is a species of arboreal gliding possum in the genus P
- Saw-billed hermitThe saw-billed hermit (Ramphodon naevius) is a hummingbird in the family Trochilidae. It i
- SawflySuborder of insects
- SawsharkFamily of fishes
- SaxatilomysSaxatilomys paulinae, Paulina's limestone rat, is a species of murid rodent native to cent
- ScalidophoraClade of ecdysozoan animals
- Scaly-sided merganserThe scaly-sided merganser or Chinese merganser (Mergus squamatus) is an endangered typical
- ScansoriopterygidaeExtinct family of dinosaurs
- ScaptotrigonaScaptotrigona is a genus of bees belonging to the family Apidae.
- ScarabaeidaeFamily of beetles
- ScarabaeinaeThe scarab beetle subfamily Scarabaeinae consists of species collectively called true dung
- ScarabaeusThe genus Scarabaeus consists of a number of Afro-Eurasian dung beetle species, including
- Scarabaeus sacerSpecies of beetle
- ScardiniusScardinius is a genus of ray-finned fish in the family Cyprinidae commonly called rudds. L
- Scarlet macawSpecies of bird
- Scarlet robinThe scarlet robin (Petroica boodang) is a common red-breasted Australasian robin in the pa
- Scarlet-backed flowerpeckerThe scarlet-backed flowerpecker (Dicaeum cruentatum) is a species of passerine bird in the
- Scarlet-bellied mountain tanagerThe scarlet-bellied mountain tanager (Anisognathus igniventris) is a species of bird in th
- Scarlet-breasted flowerpeckerThe scarlet-breasted flowerpecker (Prionochilus thoracicus) is a species of bird in the fa
- Scarlet-chested sunbirdThe scarlet-chested sunbird (Chalcomitra senegalensis) is a species of bird in the family
- Scarlet-crowned barbetThe scarlet-crowned barbet (Capito aurovirens) is a species of bird in the family Capitoni
- Scarus frenatusScarus frenatus is a species of parrotfish. Common names include bridled parrotfish, sixba
- ScatopsidaeThe minute black scavenger flies or "dung midges", are a family, Scatopsidae, of nematocer
- ScelembiidaeScelembiidae is a family of webspinners in the order Embioptera. There are about 16 genera
- ScelidosaurusEarly Jurassic armoured dinosaur genus
- SceliphrinaeSceliphrinae is a subfamily of thread-waisted wasps in the family Sphecidae. There are abo
- SceliphriniTribe of wasps
- Scent glandExocrine glands found in most mammals
- Scent houndDog type, hunting dog
- Schinderhannes bartelsiSchinderhannes bartelsi is a species of hurdiid radiodont (anomalocaridid), known from one
- SchistocercaSchistocerca is a genus of grasshoppers, commonly called bird grasshoppers, many of which
- Schistocerca americanaSpecies of grasshopper
- Schistocerca piceifronsSpecies of grasshopper
- SchistosomatidaeFamily of flukes
- SchizomidaOrder of arachnids
- SchizopteridaeFamily of true bugs
- Schmiding ZooSchmiding Zoo is a zoo at Schloss Schmiding, a castle in Upper Austria, Austria.
- SchoenicolaSchoenicola is a genus of Old World warbler in the family Locustellidae. There are two spe
- SchoeniparusSchoeniparus is a genus of passerine birds in the family Pellorneidae.
- SchreckstoffIn 1938, the Austrian ethologist Karl von Frisch made his first report on the existence of
- SchultzsuchusSchultzsuchus is an extinct genus of pseudosuchian from the Triassic Santa Maria Formation
- SciaridaeThe Sciaridae are a family of flies, commonly known as dark-winged fungus gnats. Commonly
- Scimitar oryxSpecies of oryx
- ScirtothripsScirtothrips is a genus of thrips in the family Thripidae.
- Scirtothrips dorsalisSpecies of thrip
- SciurusGenus of rodents
- ScleractiniaOrder of Hexacorallia which produce a massive stony skeleton
- ScleralcyonaceaOrder of corals
- ScleromochlusExtinct genus of reptiles
- ScolecophidiaInfraorder of snakes
- Scolopendra giganteaSpecies of Chilopoda (centipede)
- ScolopendrellidaeScolopendrellidae is a family of symphylans in the class Symphyla. There are about 9 gener
- ScolopendridaeScolopendridae (or, in older documents, Scolopendridæ) is a family of large centipedes (cl
- ScolopendromorphaScolopendromorpha is an order of centipedes also known as tropical centipedes or bark cent
- ScolytiniScolytini is a tribe of typical bark beetles in the family Curculionidae. There are at lea
- ScolytusScolytus is a genus of bark beetles (subfamily Scolytinae). It includes several species no
- ScombridaeFamily of fishes
- ScombriformesOrder of ray-finned fishes
- ScombrinaeThe Scombrinae are a subfamily of ray-finned bony fishes in the family Scombridae. Of the
- ScombriniScombrini, commonly called the true mackerels, is a tribe of ray-finned bony fishes in the
- Scops owlGenus of birds
- Scopus (bird)Scopus is a genus of wading birds containing the hamerkop (Scopus umbretta) and its extinc
- ScorpaenidaeFamily of fishes
- ScorpionidaeScorpionidae is a family of burrowing scorpions or pale-legged scorpions in the superfamil
- Scotoplanes globosaSpecies of sea cucumber
- Scottish Society for Prevention of Cruelty to AnimalsThe Scottish Society for the Prevention of Cruelty to Animals (also known as the Scottish
- Scraper (archaeology)Prehistoric tool type
- ScreamerFamily of birds
- ScrotiferaClade of mammals
- Scutigera coleoptrataSpecies of arthropod
- ScutigerellaScutigerella is a genus of symphylans with sub-cosmopolitan distribution. It is the second
- ScutosaurusExtinct genus of reptiles
- ScydmaeninaeScydmaeninae are a subfamily of small beetles, commonly called ant-like stone beetles or s
- ScyliorhinidaeFamily of fishes
- Scylla serrataSpecies of crab
- Scyllarides latusScyllarides latus, the Mediterranean slipper lobster, is a species of slipper lobster foun
- ScyphozoaClass of marine cnidarians, true jellyfish
- ScytodesScytodes is a genus of spitting spiders that occur all around the world. The most widely d
- Sea anemoneMarine animals of the order Actiniaria
- Sea appleNon-taxonomic group of sea cucumbers
- Sea eagleGenus of birds
- Sea kraitGenus of snakes
- Sea lampreySpecies of fish native to the Northern Hemisphere
- Sea lionSubfamily of aquatic mammals
- Sea penOrder of colonial marine cnidarians
- Sea slugGroup of marine gastropods
- Sea snailCommon name for snails that normally live in saltwater
- Sea spiderClass of marine arthropods
- Sea toadFamily of fishes
- Sea-MonkeysBrine shrimp sold as pets
- SeabiscuitAmerican champion thoroughbred racehorse (1933–1947)
- Seal huntingPersonal or commercial hunting of marine mammal
- Search and rescue dogDog trained to locate or retrieve a missing or trapped person
- SeashellHard, protective outer layers created by an animal that lives in the sea
- Seashell (color)Seashell is an off-white color that resembles some of the very pale pinkish tones that are
- SebastinaeSubfamily of fishes
- Sechuran foxSpecies of carnivore
- Secretariat (horse)1973 US Triple Crown of Thoroughbred Racing winner
- SedentariaSubclass of annelid worms
- Sedge wrenThe sedge wren (Cistothorus stellaris) is a small and secretive passerine bird in the fami
- SedophascolomysSedophascolomys is an extinct genus of wombat known from the Pliocene and Pleistocene of A
- Sei whaleSpecies of baleen whale
- Self-decoration camouflageSelf-decoration camouflage is a method of camouflage in which animals or soldiers select m
- Selli EventThe Selli Event, also known as OAE1a, was an oceanic anoxic event (OAE) of global scale th
- Selous' zebraSelous' zebra (Equus quagga selousi) is a subspecies of the plains zebra distributed acros
- SemaeostomeaeSemaeostomeae (literally "flag mouths") is an order of large jellyfish characterized by fo
- SemantoridaeSemantoridae is an extinct family of stem-pinnipeds with fossils found in France, Kazakhst
- SemiaquaticSpends part of their time in water, or grows partially submerged in water
- Semiplumbeous hawkThe semiplumbeous hawk (Leucopternis semiplumbeus) is a species of bird of prey in the fam
- SemnopithecusGenus of Old World monkeys
- SemnornisGenus of birds
- SenectosaurusSenectosaurus (meaning "old lizard") is an extinct genus of pareiasaur from the late Permi
- Senegalese grasshopperSpecies of grasshopper
- SengiFamily of insectivorous mammals
- SepsidaeThe Sepsidae are a family of flies, commonly called the black scavenger flies or ensign fl
- Sepsis cynipseaSpecies of fly
- SerendipaceratopsSerendipaceratops (meaning "serendipitous horned face") is a genus of herbivorous ornithis
- SergestidaeSergestidae is a family of prawns which have lived since at least the Middle Jurassic (Baj
- SeriemaFamily of birds
- SerowGenus of goat-antelope ('Capricornis')
- SerpulidaeThe Serpulidae are a family of sessile, tube-building annelid worms in the class Polychaet
- Serrognathus titanusGiant stag beetle of the family Lucanidae
- ServalMedium-sized wild cat
- Sessility (motility)Property of animals that do not use self-locomotion
- SetaHair-like structure on living organisms
- SetterType of dog used to help hunt birds
- Sex pheromoneSex pheromones are pheromones released by an organism to attract an individual of the same
- Sexual cannibalismPractice of animals eating their own mating partners
- Sexual coercion among animalsSexual coercion among non-human animals
- Sexual selection in mammalsMode of natural selection
- Seymour IslandSeymour Island or Marambio Island, is an island in the chain of 16 major islands around th
- SeymouriaExtinct genus of tetrapodomorphs
- Shaft-tailed whydahThe shaft-tailed whydah or queen whydah (Vidua regia) is a small, sparrow-like bird in the
- Shaheen falconSubspecies of bird
- ShahtooshShahtoosh (from Persian شاهتوش 'king of wools'), also known as Shatoush, is a wool obtaine
- Shallow water marine environmentMarine environment between the shore and the continental shelf
- Shark liver oilOil obtained from the livers of sharks
- Shark meatSeafood consisting of the flesh of sharks
- SharovipteryxExtinct genus of reptiles
- SheathbillGenus of birds
- Sheep–goat hybridHybrid between a sheep and a goat
- Sheffield Airey NeaveSheffield Airey Neave CMG OBE (20 April 1879 – 31 December 1961) was a British naturalist
- Shelly Beach (Manly)Shelly Beach (also known as Shelley Beach) is a beach located in Manly, a suburb of Sydney
- Shen ZhuTaiwanese ceremonial pigs
- Shetland ponyScottish breed of traditional pony
- Shining-blue kingfisherThe shining-blue kingfisher (Alcedo quadribrachys) is a species of bird in the family Alce
- ShipwormFamily of molluscs
- ShonisaurusExtinct genus of reptiles
- Short-beaked echidnaSpiny furred egg-laying mammal from Australia
- Short-eared dogSpecies of carnivore
- Short-tailed parrotThe short-tailed parrot (Graydidascalus brachyurus) is a species of bird in subfamily Arin
- Shortnose sawsharkThe shortnose sawshark, (Pristiophorus nudipinnis) or southern sawshark, is a sawshark of
- Shot silkShot silk (also called changeant, changeable silk, changeable taffeta, cross-color, change
- Shovel-billed kookaburraThe shovel-billed kookaburra (Dacelo rex), also known as the shovel-billed kingfisher, is
- ShriketitSpecies of bird
- ShrimpfishSubfamily of fishes
- ShringasaurusGenus of herbivorous Triassic horned reptile
- SiamangSpecies of ape
- Siberian blue robinThe Siberian blue robin (Larvivora cyane) is a small passerine bird that was formerly clas
- Siberian craneSpecies of bird
- Siberian flying squirrelSpecies of rodent
- Siberian grouseSpecies of bird
- Siberian musk deerThe Siberian musk deer (Moschus moschiferus) is a musk deer found in the mountain forests
- Siberian tigerTiger population in Northeast Asia
- Sibley–Ahlquist taxonomy of birdsProposed classification system of birds
- SiblicideKilling of an infant individual by its siblings
- Sibling rivalry (animals)Animals, including siblings, compete for resources such as food, territory, and potential
- SiboglinidaeFamily of annelid worms
- SicyoniaSicyonia is a genus of prawns, placed in its own family, Sicyoniidae. It differs from othe
- Side-striped jackalCanine native to Africa
- SidneyiaGenus of extinct arthropods
- Sierra MixeThe Sierra Mixe or Mixes District is a district in the east of the Sierra Norte Region of
- Sierra Nevada bighorn sheepThe Sierra Nevada bighorn sheep (Ovis canadensis sierrae) is subspecies of bighorn sheep u
- SifakaGenus of lemur
- SigaraSigara is a genus of water boatmen in the family Corixidae. Some species within this genus
- SighthoundType of dog
- SigniphoridaeFamily of wasps
- Sika deerSpecies of deer native to much of East Asia
- SilesauridaeExtinct family of dinosaur-like reptiles
- Silk industry in ChinaChina is the world's largest and earliest silk producer. The vast majority of Chinese silk
- Silkie (chicken breed)Chinese fluffy breed of chicken
- Silky-flycatcherFamily of birds
- SilphinaeFamily of beetles
- SilvanerpetonSilvanerpeton is an extinct genus of early reptiliomorph found by Stan Wood in the East Ki
- SilvanidaeFamily of beetles
- Silver carpSpecies of fish
- Silver hakeThe silver hake, Atlantic hake, or New England hake (Merluccius bilinearis) is a merluccid
- Silver-haired batSpecies of bat
- SilverFinSilverFin is the first novel in the Young Bond series that depicts Ian Fleming's superspy
- SilverfishSmall land insect in the order Zygentoma
- Silverleaf whiteflySpecies of true bug
- SilverstoneiaSilverstoneia is a genus of poison dart frogs (family Dendrobatidae) from southern Central
- Silvery-fronted tapaculoThe silvery-fronted tapaculo (Scytalopus argentifrons) is a species of bird in the family
- SimianInfraorder of primates
- Simmental cattleSwiss breed of cattle
- SimoedosaurusSimoedosaurus is an extinct reptile known from the Paleocene of North America, Europe and
- SimoselapsSimoselaps, or Australian coral snakes, is a genus composed of 12 species of venomous elap
- SimosuchusExtinct genus of reptiles
- SinodelphysSinodelphys is an extinct mammal from the Early Cretaceous, estimated to be 125 million ye
- SinomacropsSinomacrops is a genus of extinct anurognathid pterosaur from the Middle to Late Jurassic
- SinomastodonSinomastodon ("Chinese mastodont") is an extinct gomphothere genus (of order Proboscidea)
- Sinomicrurus macclellandiSinomicrurus macclellandi, commonly known as MacClelland's coral snake, is a species of ve
- SinopterusSinopterus (meaning "Chinese wing") is a genus of tapejarid pterodactyloid pterosaur from
- SinornithoidesSinornithoides (meaning "Chinese bird form") is a genus of troodontid theropod dinosaurs c
- SinosauropteryxExtinct genus of dinosaurs
- SinraptorSinraptor () is a genus of metriacanthosaurid theropod dinosaur from the Late Jurassic. Th
- Sipaliwini DistrictSipaliwini is the largest district of Suriname, located in the south. Sipaliwini is the on
- Siphon (mollusc)Anatomical structure which is part of the body of some aquatic molluscs
- Siphonal canalThe siphonal canal is an anatomical feature of the shells of certain groups of sea snails
- SiphonariidaeSiphonariidae, also known as false limpets, are a taxonomic family of small to medium-size
- SiphonophoreOrder of colonial hydrozoans with differentiated zooids
- SiphonophoridaSiphonophorida (Greek for "tube bearer") is an order of millipedes containing two families
- SiphonotretidaSiphonotretida is an extinct order of linguliform brachiopods in the class Lingulata. The
- SipunculaClass of unsegmented annelids
- SipunculidaeSipunculidae is a family of peanut worms.
- Sira curassowThe Sira curassow (Pauxi koepckeae) is a species of bird in the family Cracidae. It is fou
- SirenidaeFamily of amphibians
- Sirex noctilioSpecies of sawfly
- SiricoideaThe superfamily Siricoidea is an archaic group of the order Hymenoptera, consisting of six
- SirindhornaSirindhorna is a genus of hadrosauroid ornithopod dinosaur from Early Cretaceous deposits
- Sitka deerThe Sitka deer or Sitka black-tailed deer (Odocoileus hemionus sitkensis) is a subspecies
- SitophilusSitophilus is a genus of weevils in the tribe Litosomini. Some species are familiar as pes
- SittellaGenus of birds
- Sivalik HillsMountain range in India, Pakistan and Nepal
- SivapithecusGenus of extinct Asian ape
- SivatheriumExtinct genus of mammals
- Six-legged Soldiers2008 book by Jeffrey A. Lockwood
- Skeletal pneumaticitySkeletal pneumaticity is the presence of air spaces within bones. It is generally produced
- Skipjack tunaSpecies of fish
- SkuaFamily of birds
- SkybalonyxSkybalonyx is an extinct genus of drepanosaur from the Chinle Formation in the Late Triass
- SkyReach BushCatThe SkyReach BushCat is a South African light-sport aircraft developed from the Rainbow Ai
- Slate-colored hawkThe slate-colored hawk (Buteogallus schistaceus) is a species of bird of prey in the famil
- Slaty-breasted tinamouThe slaty-breasted tinamou or Boucard's tinamou (Crypturellus boucardi) is a type of tinam
- Slave-making antSpecies of ants that steal young ants of another species to contribute to their colony
- Slender-billed minerThe slender-billed miner (Geositta tenuirostris) is a species of bird in the subfamily Scl
- SlimeheadFamily of fishes
- Slipper lobsterFamily of crustaceans
- Sloth bearSpecies of bear
- SlugShell-less terrestrial gastropod mollusc
- Small carbonaceous fossilSmall carbonaceous fossils (SCFs) are sub-millimetric organic remains of organisms preserv
- Small mammals as petsThe domestication of small mammals to keep as pets is a relatively recent development, ari
- Small Mauritian flying foxExtinct species of bat
- Smaug breyeriSmaug breyeri, also known commonly as the Waterberg dragon lizard or the Waterberg girdled
- SmilodonExtinct genus of saber-toothed cat
- SminthidaeFamily of rodents
- SminthopsinaeThe subfamily Sminthopsinae includes several genera of small, carnivorous marsupials nativ
- SminthopsiniSmintopsini is a tribe of marsupial in the family Dasyuridae.
- Smooth green snakeThe smooth green snake (Opheodrys vernalis) is a species of North American nonvenomous sna
- Smooth-coated otterSpecies of carnivore
- SmutsiaGenus of mammals
- Snag (ecology)In forest ecology, a snag refers to a standing dead or dying tree, often missing a top or
- SnailShelled gastropod
- SnakeflyOrder of insects
- SnipeCommon name for wading birds
- Snipe eelFamily of fishes
- Snout–vent lengthSnout–vent length (SVL) is a morphometric measurement taken in herpetology from the tip of
- Snow gooseSpecies of bird
- Snow Hill IslandSnow Hill Island is an almost completely snowcapped island, 33 km (21 mi) long and 12 km (
- Snowshoe hareSpecies of mammal
- Snowy owlSpecies of owl
- Snowy ploverThe snowy plover (Anarhynchus nivosus) is a small shorebird found in the Americas. It is a
- Snowy sheathbillThe snowy sheathbill (Chionis albus), also known as the greater sheathbill, pale-faced she
- Sobrante Ridge Regional PreserveSobrante Ridge Regional Preserve (SRRP) is a regional park in Richmond, Contra Costa Count
- Social facilitation in animalsMechanism of animal behavior propagation
- Social groomingBehavior in social animals
- Social learning in animalsObservation or interaction with another animal
- Soft-bodied organismOrganism that lacks a rigid skeleton
- Solanum rostratumSolanum rostratum is a species of nightshade (genus Solanum) that is native to the United
- SolasteridaeThe Solasteridae are a family of sea stars.
- Soldier beetleFamily of beetles
- Sole (fish)Fish name belonging to several families
- Solen (bivalve)Solen is a genus of marine bivalves in the family Solenidae. (Gk. 'solen'=pipe)
- SolenodonFamily of mammals
- Solenodon (genus)Solenodon is a genus of small, shrew-like mammals native to the Caribbean. It is one of tw
- SolenodonsaurusSolenodonsaurus ("single-tooth lizard") is an extinct genus of reptiliomorphs that lived i
- SolenopsinSolenopsin is a lipophilic alkaloid with the molecular formula C17H35N found in the venom
- SolifugaeOrder of arachnids
- Solo ManExtinct subspecies of Homo erectus
- SolomysSolomys is a genus of rodent in the family Muridae. These large rats, which are all seriou
- Somali catBreed of cat
- SomniosusSomniosus is a widely distributed genus of deepwater dogfish sharks in the family Somniosi
- SoricomysSoricomys, the shrew-mice, are a genus of rodents in the family Muridae. They are carnivor
- Sotteville-lès-RouenSotteville-lès-Rouen (French pronunciation: , literally Sotteville near Rouen) is a commun
- South American coatiSpecies of carnivore
- South American foxGenus of carnivores
- South American fur sealSpecies of mammal
- South American gray foxSpecies of carnivore
- South China giant salamanderSpecies of amphibian
- South Island oystercatcherThe South Island oystercatcher or South Island pied oystercatcher (Haematopus finschi) is
- South Island stout-legged wrenThe South Island stout-legged wren or Yaldwyn's wren (Pachyplichas yaldwyni) is an extinct
- South-western black rhinocerosThe south-western black rhinoceros (Diceros bicornis occidentalis) is a subspecies of the
- Southern boubouThe southern boubou (Laniarius ferrugineus) ('ferrugineus' - rust-coloured) is a bushshrik
- Southern elephant sealSpecies of marine mammal
- Southern emu-wrenThe southern emu-wren (Stipiturus malachurus) is a species of bird in the Australasian wre
- Southern fin whaleThe southern fin whale (Balaenoptera physalus quoyi) is a subspecies of fin whale that liv
- Southern fulmarThe southern fulmar (Fulmarus glacialoides) is a seabird of the Southern Hemisphere. Along
- Southern giraffeSpecies of giraffe
- Southern hawkerSpecies of dragonfly
- Southern HoundThe Southern Hound was a breed of dog that existed in Britain probably until sometime in t
- Southern red-backed voleSpecies of rodent
- Southern right whaleSpecies of whale
- Southern spotted skunkThe southern spotted skunk (Spilogale angustifrons) is a species of mammal in the skunk fa
- Southwestern red squirrelThe southwestern red squirrel or Fremont's squirrel (Tamiasciurus fremonti) is a species o
- Soybean aphidSpecies of true bug
- SpalacidaeFamily of rodents
- SpalaxGenus of rodents
- SpanielDog type
- Spanish dancerSpecies of gastropod
- Spanish Fighting BullCattle breed used in bull fights and spectacles
- Spanish mackerelTribe of fishes
- SparassodontaExtinct order of mammals
- SparidaeFamily of fishes
- SparnotheriodontidaeSparnotheriodontidae is an enigmatic extinct family of litopterns known primarily from tee
- SpartaeinaeThe Spartaeinae are a subfamily of the spider family Salticidae (jumping spiders). The sub
- Species descriptionFormal description of a discovered species
- Species richnessVariety of species in an ecological community, landscape or region
- Specific name (zoology)Term used in zoology
- Speckled mousebirdThe speckled mousebird (Colius striatus) is the largest species of mousebird, as well as o
- Spectacled bearSpecies of mammal
- Spectrunculus grandisSpectrunculus grandis is a species of Rhizopharyngia ray-finned fish in the cusk-eel famil
- SpeleomantesSpeleomantes, or European cave salamanders, are a genus of salamander in the family Pletho
- SpermophilusGenus of rodents
- SphaeriusGenus of beetles
- SphaeromatideaSphaeromatidea is a suborder of isopod crustaceans.
- SphaerotheriidaSphaerotheriida is an order of millipedes in the infraclass Pentazonia, sometimes known as
- SphagesauridaeSphagesauridae is a Gondwanan family of mesoeucrocodylians that lived during the Late Cret
- SphecidaeFamily of wasps
- Sphecius speciosusSpecies of wasp
- SphecomyrmaExtinct genus of ants
- SphecomyrminaeExtinct subfamily of ants
- SphenacodontoideaSphenacodontoidea is a node-based clade that is defined to include the most recent common
- SphenariumSphenarium is a genus of grasshoppers in the family Pyrgomorphidae, native to Mexico and n
- SphenophoriniThe Sphenophorini are an important tribe of weevils in the subfamily Dryophthorinae; howev
- SphindidaeFamily of beetles
- SphingidaeFamily of insects
- Sphinx ligustriSphinx ligustri, the privet hawk moth, is a moth found in most of the Palearctic realm. Th
- Sphynx catHairless breed of cat
- Spider silkProtein fiber made by spiders
- SpilomyiaSpilomyia is a genus of hoverflies. Many species in the genus show Batesian mimicry of was
- Spilomyia longicornisSpecies of fly
- Spinifex pigeonThe spinifex pigeon (Geophaps plumifera), also known as the plumed-pigeon or gannaway pige
- SpinosauridaeFamily of dinosaurs
- SpinosaurusGenus of spinosaurid dinosaur
- Spiny lobsterFamily of crustaceans
- Spiny mouseThe term spiny mouse refers to any species of rodent within the genus Acomys. Similar in a
- Spiny red gurnardThe spiny red gurnard (Chelidonichthys spinosus) is a species of marine ray-finned fish be
- Spiracle (arthropods)Opening in the exoskeletons of some arthropods
- SpiraliaClade of protostomes with spiral cleavage during early development
- Spirastrella coccineaSpirastrella coccinea is a species of marine sponge in the family Spirastrellidae. It is f
- Spire (mollusc)A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls
- SpiriferidaOrder of brachiopods
- SpirostreptidaeSpirostreptidae is a family of millipedes in the order Spirostreptida. It contains around
- SpirulaSpecies of cephalopod
- SpirurinaSuborder of roundworms
- SpodopteraSpodoptera is a genus of moths of the family Noctuidae erected by Achille Guenée in 1852.
- Spodoptera mauritiaSpecies of moth
- Sponge microbiomesCommunity of microorganisms found in or around sponges
- SpongiaSpongia is a genus of marine sponges in the family Spongiidae, originally described by Car
- Spongia officinalisSpecies of sponge
- SponginProtein found in sponges
- SpoonbillGenus of birds
- Spot-breasted antvireoThe spot-breasted antvireo (Dysithamnus stictothorax) is a Near Threatened species of bird
- Spot-crowned woodcreeperThe spot-crowned woodcreeper (Lepidocolaptes affinis), is a passerine bird in the subfamil
- Spot-winged falconetThe spot-winged falconet (Spiziapteryx circumcincta) is a species of bird of prey in subfa
- Spotted doveSpecies of bird
- Spotted green pigeonThe spotted green pigeon or Liverpool pigeon (Caloenas maculata) is a species of pigeon wh
- Spotted hyenaSpecies of hyena
- Spotted lanternflySpecies of planthopper indigenous to Southeast Asia
- Spotted linsangThe spotted linsang (Prionodon pardicolor) is a linsang, a tree-dwelling carnivorous mamma
- Spotted pardaloteThe spotted pardalote (Pardalotus punctatus) is a small passerine bird native to eastern a
- Spotted ratfishSpecies of cartilaginous fish
- Spotted skunkGenus of carnivores
- Spotted wobbegongThe spotted wobbegong (Orectolobus maculatus) is a carpet shark in the family Orectolobida
- SpringbokAntelope of southwest and south Africa
- Spruce sawfliesName for various sawfly species
- SqualomorphiSuperorder of sharks
- SquamataOrder of reptiles
- Squat lobsterDecapod crustaceans in the infraorder Anomura
- Squatter pigeonThe squatter pigeon (Geophaps scripta) is a species of bird in the family Columbidae. It i
- Squilla mantisSpecies of crustacean
- SquillidaeSquillidae is a family of mantis shrimp, the only family in the superfamily Squilloidea. T
- Squirrel monkeyGenus of primates
- St. Bernard (dog breed)Dog breed
- St. Mary River FormationThe St. Mary River Formation is a geologic formation of Late Cretaceous (71.9-67 Ma) age o
- Stag beetleFamily of insects
- StagodontidaeExtinct family of mammals
- StaphyliniformiaStaphyliniformia is a large infraorder of beetles. It contains over 70,000 described speci
- StaphylininaeSubfamily of beetles
- StaphylininiStaphylinini is a tribe of large rove beetles in the family Staphylinidae. There are at le
- StaphylinoideaStaphylinoidea is a superfamily of beetles. It is a very large and diverse group with worl
- Star-nosed moleSpecies of mole
- Statue of BaltoA bronze statue of Balto by Frederick Roth is installed in Central Park, Manhattan, New Yo
- SteenbokThe steenbok (Raphicerus campestris) is a common small antelope of southern and eastern Af
- StegaspidinaeStegaspidinae is a subfamily of treehoppers in the family Membracidae.
- StegocephaliStegocephali (often spelled Stegocephalia, from Greek στεγοκεφαλια, lit. "roofed head") is
- StegocerasGenus of pachycephalosaurid dinosaurs
- StegodonGenus of extinct proboscidean
- Stegodon auroraeStegodon aurorae is an extinct species of Stegodon known from Early Pleistocene (2.0 Ma –
- StegodontidaeFamily of extinct elephant-like mammals
- StegoloxodonStegoloxodon is an extinct genus of dwarf elephant known from the Early Pleistocene of Ind
- StegopeltaStegopelta (meaning "roofed shield") is a genus of struthiosaurin nodosaurid dinosaur. It
- StegosauriaExtinct clade of armored dinosaurs
- Steller sea lionSpecies of carnivore
- Steller's sea cowExtinct species of marine mammal
- Stem tetrapodaThe Stem Tetrapoda are a cladistically defined group, consisting of all animals more close
- StenodermatinaeStenodermatinae is a large subfamily of bats in the family Phyllostomidae.
- StenogastrinaeThe Stenogastrinae are a subfamily of social wasps included in the family Vespidae. They a
- StenopodainaeThe Stenopodainae are a subfamily of Reduviidae (assassin bugs). Often cryptically coloure
- StenopodidaeStenopodidae is a family of decapods in the order Decapoda, sometimes known as boxer shrim
- StenopodideaInfraorder of crustaceans
- StenopogoninaeStenopogoninae is a subfamily of robber flies in the family Asilidae. There are more than
- Stenopus hispidusStenopus hispidus is a shrimp-like decapod crustacean belonging to the infraorder Stenopod
- StenostiridaeFamily of birds
- Stephanian (stage)The Stephanian is a stage in the regional stratigraphy of northwest Europe with an age bet
- StephanorhinusExtinct genus of rhinoceros
- Steppe bisonExtinct species of mammal
- Steppe eagleSpecies of bird
- StereospondyliExtinct suborder of amphibians
- Sterile insect techniqueMethod of biological control for insect populations
- Sterility (physiology)Inability to sexually reproduce
- SternoptyxSternoptyx is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae
- SternorrhynchaOrder of true bugs
- StethacanthusExtinct genus of cartilaginous fishes
- SthenurinaeSthenurinae (from Sthenurus, Greek for 'strong-tailed') is a subfamily within the marsupia
- SthenurusExtinct genus of marsupials
- StichopogoninaeStichopogoninae is a subfamily of robber flies in the family Asilidae. There are about 14
- Stick mantisCommon name for several praying mantises
- Stickeen brown bearThe Stickeen brown bear (Ursus arctos stikeenensis), also known as Stikine brown bear, is
- StictocephalaStictocephala is a genus of treehoppers in the family Membracidae; in the subfamily Smilii
- StiltCommon name for several species of bird
- Stimulator of interferon genesStimulator of interferon genes (STING), also known as transmembrane protein 173 (TMEM173)
- Stingless beeBee tribe, reduced stingers, strong bites
- Stingray injuryA stingray injury is caused by the venomous tail spines, stingers or dermal denticles of r
- Stink badgerStink badgers or false badgers are the species of the genus Mydaus of the skunk family of
- StiriinaeStiriinae is a subfamily of owlet moths in the family Noctuidae. There are more than 20 ge
- StitchbirdSpecies of bird
- StomatosuchidaeExtinct family of reptiles
- Stomias boa boaStomias boa boa, also called the scaly dragonfish or boa dragonfish, is a subspecies of ab
- StomiiformesOrder of fishes
- StomodeumThe stomodeum, also called stomatodeum or stomatodaeum, is a depression between the brain
- StomoxyiniStomoxyini is a tribe of flies from the family Muscidae.
- Stone-curlewFamily of birds
- Storeria occipitomaculataStoreria occipitomaculata, commonly known as the redbelly snake or the red-bellied snake,
- Storrs L. OlsonStorrs Lovejoy Olson (April 3, 1944 – January 20, 2021) was an American biologist and orni
- Straight-billed hermitThe straight-billed hermit (Phaethornis bourcieri) is a species of bird in the family Troc
- Straw-coloured fruit batSpecies of mammal
- Streaked bowerbirdThe streaked bowerbird (Amblyornis subalaris) is a species of bowerbird, native to the Bir
- StrepsipteraOrder of insects
- Striated pardaloteThe striated pardalote (Pardalotus striatus) is the least colourful and most common of the
- StrigidaeFamily of birds
- StrigogypsStrigogyps is an extinct genus of prehistoric bird from the Middle Eocene to Early Oligoce
- Stripe-tailed hummingbirdThe stripe-tailed hummingbird (Eupherusa eximia) is a species of hummingbird in the "emera
- Striped hyenaSpecies of hyena
- Striped skunkSpecies of mammal
- StrisoresClade of birds
- Strix (bird)Genus of birds
- Strongylocentrotus purpuratusSpecies of sea urchin
- StruthionidaeFamily of birds
- StruthioniformesOrder of birds
- Stuart W. FrostAmerican entomologist
- Stuhlmann's sengiThe Stuhlmann's sengi or white-tailed sengi (Rhynchocyon stuhlmanni) is a species of eleph
- StupendemysExtinct genus of turtles
- SturnellaThe genus Sturnella are North American grassland passerine birds called meadowlarks. The g
- SturniaSturnia is a genus of Asian birds in the starling family Sturnidae. It is sometimes merged
- StylidensStylidens is an extinct genus of mammaliaforms, possibly belonging to Morganucodonta, that
- StylophoraExtinct group of marine invertebrates
- Stylophora (coral)Stylophora is a genus of colonial stony corals in the family Pocilloporidae. They are comm
- StylopidaeStylopidae is a family of twisted-winged insects in the order Strepsiptera. There are abou
- StylopsStylops is a genus of obligately endoparasitic insects in the family Stylopidae. Hosts are
- StyracosaurusGenus of ceratopsian dinosaurs
- SubfamilyIntermediate taxonomic rank below family
- Subfossil lemurLemurs from Madagascar that are represented by recent (subfossil) remains
- Substrate (aquatic environment)Substrate is the earthy material that forms or collects at the bottom of an aquatic habita
- SubtropicsGeographic and climate zone
- SuchodusSuchodus is an extinct genus of marine crocodyliform from the Middle to Late Jurassic peri
- SuchogorgonSuchogorgon is an extinct genus of gorgonopsids from Russia. It was a medium-sized animal
- Sucking louseSucking lice (Anoplura, formerly known as Siphunculata) have around 500 species and repres
- Sucrose gapThe sucrose gap technique is used to create a conduction block in nerve or muscle fibers.
- Sue (dinosaur)Exceptional Tyrannosaurus rex fossil
- Sugar gliderSpecies of Australian marsupial
- SugarbirdGenus of birds
- SuidaeFamily of mammals belonging to even-toed ungulates
- SuinaeSubfamily of mammals
- SulcusuchusSulcusuchus is a genus of polycotylid plesiosaur from the Late Campanian to Early Maastric
- SuliformesOrder of birds
- Sumatran elephantSubspecies of mammal
- Sumatran orangutanSpecies of ape
- Sumatran rhinocerosEndangered species of Asian rhinoceros
- Sumatran tigerTiger subspecies endemic to Sumatra
- Summer SquallSummer Squall (March 12, 1987 – September 22, 2009) was an American thoroughbred racehorse
- Sun bearTropical species of bear
- Sun conureThe sun conure (Aratinga solstitialis), also known as the sun parakeet, is a medium-sized,
- SunbitternSpecies of bittern-like bird
- SuncusSuncus is a genus of shrews in the family Soricidae.
- Sunda clouded leopardSpecies of carnivore
- Sunda leopard catSmall wild cat
- SundalandBiogeographic region of Southeast Asia
- SundamysSundamys is a genus of rodent in the family Muridae, found mostly in Indonesia and Malaysi
- Sunflower sea starSpecies of echinoderm
- Superseded combinationIn taxonomy, a superseded combination is a notice of change to the binomial nomenclature o
- Sur Lípez ProvinceSur Lípez or Sud Lípez is a province in the Potosí Department in Bolivia. The seat of the
- Sus (genus)Genus of even-toed ungulates
- SvalövSvalöv (Swedish pronunciation: ) is a locality and the seat of Svalöv Municipality, Skåne
- Sven Ludvig LovénProf Sven Ludvig Lovén (6 January 1809 – 3 September 1895), was a Swedish marine zoologist
- Svenska SpindlarThe book Svenska Spindlar or Aranei Svecici (Swedish and Latin, respectively, for "Swedish
- SwamphenGenus of birds
- Swan gooseSpecies of bird
- SwiftletTribe of birds in the swift family
- Swim bladderGas-filled organ that contributes to the ability of a fish to control its buoyancy
- Swimming with dolphinsForm of therapy or recreation for humans
- Syllis ramosaSyllis ramosa is a species of polychaete worm in the family Syllidae. It is found in the d
- Sylvatic plagueSylvatic plague is an infectious bacterial disease caused by the plague bacterium (Yersini
- SylviidaParvorder of birds
- SylviidaeFamily of birds
- SymaSyma is a genus of tree kingfishers in the family Alcedinidae that are resident in New Gui
- SymbionGenus of microscopic organism that are commensal with lobsters
- SymphylaClass of many-legged arthropods
- SyndesinaeSyndesinae is a subfamily of stag beetles in the family Lucanidae. There are at least two
- SyngnathidaeFamily of fishes
- SyngnathiformesOrder of fishes
- SynodontidaeFamily of fishes
- SynodusSynodus is a genus of fish in the family Synodontidae found in Atlantic, Indian, and Pacif
- Synodus intermediusSynodus intermedius, the common sand diver, is a species of fish in the lizardfish family,
- Syritta pipiensSyritta pipiens, sometimes called the thick-legged hoverfly, is one of the most common spe
- SyrphoideaThe Syrphoidea are a superfamily of flies containing only two families under present class
- SyrrhaptesSyrrhaptes is a genus of birds in the sandgrouse family. The genus name is from Ancient Gr
