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- MaastrichtCity and municipality in Limburg, Netherlands
- Macaca fascicularisSpecies of Old World monkey
- MacawGroup of birds in the parrot family
- MacDonnell RegionThe MacDonnell Regional Council is a local government area of the Northern Territory, Aust
- MachairodontinaeExtinct subfamily of sabertooth cats
- MachilidaSuborder of jumping bristletails
- MachilidaeFamily of jumping bristletails
- Machilinus aurantiacusMachilinus aurantiacus is a species of rock bristletail in the family Meinertellidae. It i
- MachiyaMachiya (町屋/町家) are traditional wooden townhouses found throughout Japan and typified in t
- MacraucheniaExtinct genus of camel-like ungulate
- MacraucheniinaeMacraucheniinae is an extinct subfamily of macraucheniids that lived from the Late Miocene
- MacrobrachiumMacrobrachium is a genus of freshwater prawns or shrimps characterised by the extreme enla
- Macrobrachium rosenbergiiSpecies of prawn
- MacrodasyidaMacrodasyida is an order of gastrotrichs. Members of this order are somewhat worm-like in
- MacrodontophionMacrodontophion (meaning "long-toothed snake") is the name given to a dubious genus of lop
- MacropodidaeFamily of marsupial mammals
- MacropodiformesSuborder of marsupials
- MacropodinaeSubfamily of marsupials
- MacropusGenus of marsupials
- MacrosphenidaeFamily of birds
- Macrostomum lignanoMacrostomum lignano is a free-living, hermaphroditic flatworm. It is transparent and of sm
- MacrotermesGenus of termites
- Macrotermes bellicosusSpecies of insect
- Macrotermes carbonariusSpecies of termite
- MacrotermitinaeSubfamily of termites
- MacrotisGenus of marsupials
- Madagascar dry deciduous forestsThe Madagascar dry deciduous forests represent a tropical dry forest ecoregion situated in
- Madagascar hissing cockroachSpecies of cockroach
- Madagascar lowland forestsThe Madagascar lowland forests or Madagascar humid forests are a tropical moist broadleaf
- Madagascar owlThe Madagascar owl (Asio madagascariensis), also known as the Madagascan owl or Madagascar
- Madagascar ploverThe Madagascar plover (Anarhynchus thoracicus), also known as the black-banded plover, is
- Madagascar pygmy kingfisherThe Madagascar pygmy kingfisher (Corythornis madagascariensis) is a species of bird in the
- MadtsoiidaeExtinct family of snakes
- Madygen FormationThe Madygen Formation (Russian: Madygen Svita) is a Middle–Late Triassic (Ladinian–Carnian
- Magellanic oystercatcherThe Magellanic oystercatcher (Haematopus leucopodus) is a species of wader in the family H
- Magellanic ploverSpecies of bird
- MaggotLarva of a fly
- Magny-les-HameauxMagny-les-Hameaux (French pronunciation: ) is a commune in the Yvelines department in the
- MagpieLarge bird in the corvid family
- Magpie duckThe Magpie is a British breed of domestic duck. It has distinctive black and white marking
- Magpie gooseSpecies of waterfowl
- Maguari storkThe maguari stork (Ciconia maguari) is a large species of stork that inhabits seasonal wet
- Mahananda Wildlife SanctuaryMahananda Wildlife Sanctuary (Pron: móhɑ́nɑ́ndaa) is located on the foothills of the Himal
- MahioleHawaiian feather helmets, known as mahiole in the Hawaiian language, were worn with feathe
- Mahogany gliderSpecies of marsupial
- MaindroniidaeMaindroniidae is a very small family of silverfish, basal insects belonging to the order Z
- Maine CoonBreed of cat
- Mainland serowThe mainland serow (Capricornis sumatraensis) is a species of serow native to the Himalaya
- Maize weevilSpecies of beetle
- Maja squinadoSpecies of crab
- MajoideaSuperfamily of crabs
- Malabar spiny dormouseThe Malabar spiny dormouse (Platacanthomys lasiurus) is a species of muroid rodent endemic
- Malachite kingfisherThe malachite kingfisher (Corythornis cristatus) is a river kingfisher which is widely dis
- MalaconotoideaSuperfamily of birds
- MalacoptilaMalacoptila is a genus of puffbirds in the family Bucconidae, one of ten genera.
- Malagasy kingfisherThe Malagasy kingfisher or Madagascar kingfisher (Corythornis vintsioides) is a species of
- Malagos Garden ResortThe Malagos Garden Resort is an agri-ecotourism site in Davao City, Philippines.
- MalawisaurusMalawisaurus (meaning "Malawi lizard") is an extinct genus of titanosaurian sauropod dinos
- Malayan tapirSpecies of mammal
- MalayopythonMalayopython is a genus of constricting snakes in the family Pythonidae. The genus is nati
- MalbrouckThe malbrouck (Chlorocebus cynosuros) is an Old World primate from Africa that belongs to
- MaledictosuchusMaledictosuchus is an extinct genus of marine crocodyliform belonging to the family Metrio
- MaleficaMalefica (meaning "witch" or "sorceress") is a genus of hadrosaurid dinosaur from the Late
- Mallee emu-wrenThe mallee emu-wren (Stipiturus mallee) is a species of bird in the Australasian wren fami
- MallophagaSuborder of lice
- Malpighian tubule systemExcretory and osmoregulatory system
- MalurusMalurus is a genus of bird in the Australasian wren family, Maluridae.
- MamenchisauridaeExtinct family of dinosaurs
- Mammal classificationTaxonomy of mammals
- Mammal toothDetails of teeth found in many warm-blooded vertebrate animals
- Mammalia in the 10th edition of Systema NaturaeMammals in Carl Linnaeus's classification
- MammaliaformesClade of mammals and extinct relatives
- MammaliamorphaMammaliamorpha is a clade of cynodonts. It contains the clades Tritylodontidae and Mammali
- Mammals of AustraliaThe mammals of Australia have a rich fossil history, as well as a variety of extant mammal
- Mammals of New ZealandPrior to human settlement, the mammals of New Zealand consisted entirely of several specie
- Mammoth steppePrehistoric biome
- MammutidaeExtinct family of mammals
- Man o' War StakesThe Man o' War Stakes is a Grade II American thoroughbred horse race for horses aged four-
- Man-eating animalCreature that preys on humans
- ManakinFamily of South American birds
- ManateeGenus of mammals
- Manchurian hareSpecies of mammal
- MandasuchusMandasuchus is an extinct genus of loricatan pseudosuchian from the Manda Formation of Tan
- Mandible (insect mouthpart)Insect mandibles are a pair of appendages near the insect's mouth, and the most anterior o
- Mandibular fossaThe mandibular fossa, also known as the glenoid fossa in some dental literature, is the de
- Mandibular symphysisLine where two halves of the jaw fuse
- MandrillSpecies of Old World monkey from Africa
- MandrillusMandrillus is a genus of large Old World monkeys distributed throughout central and southe
- Maned wolfSpecies of carnivore
- ManemergusManemergus is a genus of polycotylid plesiosaur from the Late Cretaceous (Turonian) of Mor
- MangabeyMangabeys are West African Old World monkeys, with species in three of the six genera of t
- Mangrove crabCrabs that live on or among mangroves
- Manicina areolataManicina areolata, commonly known as rose coral, is a colonial species of stony coral. It
- ManiraptoriformesManiraptoriformes is a clade of dinosaurs with pennaceous feathers and wings that contains
- ManisGenus of mammals
- Manis palaeojavanicaGiant asian pangolin (Manis palaeojavanica ["ancient Javan pangolin"]), is an extinct spec
- Manot 1Hominin fossil
- Mansonia (fly)Genus of mosquitoes
- MantellaGenus of amphibians
- MantellidaeThe Mantellidae are an amphibian family of the order Anura (frogs and toads), and are ende
- MantellinaeMantellinae is a subfamily of frogs in the family Mantellidae. These frogs are native to M
- MantidaeFamily of praying mantises
- Mantis shrimpOrder of crustaceans
- Mantle (mollusc)Part of the anatomy of molluscs
- Mantled guerezaThe mantled guereza (Colobus guereza), also known simply as the guereza, the eastern black
- MantophasmatidaeFamily of insects
- Manx catBreed of cat
- MapudungunAraucanian language
- Mara (mammal)Genus of rodents
- Marabou storkSpecies of bird
- Marcano's solenodonMarcano's solenodon (Solenodon marcanoi) is an extinct species of mammal in the family Sol
- MargaretamysMargaretamys is a genus of rodent in the family Muridae endemic to the island of Sulawesi
- MargarodidaeThe Margarodidae (illegitimately as Margodidae) or ground pearls are a family of scale ins
- MargaySpecies of feline mammal
- MarginocephaliaExtinct clade of dinosaurs
- MaricolaMaricola is a suborder of triclad flatworms including species that mainly inhabit salt wat
- Marie Jules César SavignyMarie Jules César Lelorgne de Savigny (French: ; 5 April 1777 – 5 October 1851) was a Fren
- Marine fishFish that live all or much of their lives in seawater
- Marine hatchetfishSubfamily of fishes
- Marine iguanaSpecies of marine reptile endemic to Galapagos Islands
- Marine larval ecologyMarine larval ecology is the study of the factors influencing dispersing larvae, which man
- Marine mammalMammals that rely on marine environments for feeding
- Marine Mammal Protection ActAct of the United States Congress in 1972
- Marine reptileAquatically secondarily adapted reptiles
- MariobezziinaeMariobezziinae is a subfamily of bee flies in the family Bombyliidae. There are about 10 g
- Mark P. WittonMark Paul Witton is a British vertebrate palaeontologist, author, and palaeoartist best kn
- MarkhorSpecies of mammal
- MarkueliaMarkuelia is a genus of fossil worm-like bilaterian animals allied to Ecdysozoa and known
- Marlon BundoFormer Bunny of the United States
- MarmosetSmall South American monkeys
- Marsh deerSpecies of mammals
- Marsh owlThe marsh owl (Asio capensis) is a medium to large species of owl in the family Strigidae.
- Marsh shrewSpecies of shrew
- Marsupial moleGenus of marsupials
- Martha (passenger pigeon)Last known passenger pigeon
- Martin BurkenroadMartin David Burkenroad (March 20, 1910 – January 12, 1986) was an American marine biologi
- Martín EzcurraMartín Daniel Ezcurra (born April 23, 1987) is an Argentine palaeontologist naming many ex
- Mary River codThe Mary River cod (Maccullochella mariensis) is a species of temperate perch native to th
- Masai giraffeSpecies of giraffe
- Mascarene paradise flycatcherThe Mascarene paradise flycatcher (Terpsiphone bourbonnensis) is a species of bird in the
- Mascarene swiftletThe Mascarene swiftlet or Mauritius swiftlet (Aerodramus francicus) is a species of swift
- MasiakasaurusNoasaurid theropod dinosaur genus from the Late Cretaceous period
- MasillosteusMasillosteus ("bony one from Messel") is an extinct genus of gar that inhabited western No
- Masked spinefootThe masked spinefoot (Siganus puellus), also known as the masked rabbitfish, bluelined rab
- Massachusetts Humane SocietyThe Humane Society of the Commonwealth of Massachusetts, better known as the Massachusetts
- MastodonExtinct genus of proboscideans
- MastomysMastomys is a genus of rodent in the family Muridae endemic to Africa. It contains eight s
- MastotermesGenus of termites
- Mastotermes darwiniensisMastotermes darwiniensis, common names giant northern termite and Darwin termite, is a ter
- Mata MengeMata Menge is an early Middle Pleistocene paleoanthropological site located in the Ola Bul
- Mate choiceMechanism for evolution
- Mate choice copyingStrategy used by organisms
- Mathurin Jacques BrissonFrench zoologist and natural philosopher
- MatinaeMatinae is a subfamily of predaceous diving beetles in the family Dytiscidae. There are at
- Mating callVocalization used to attract mates
- Mating plugGelatinous secretion used in the mating of some species
- Mating systemSystem of sexual reproduction in a population
- Matschie's tree-kangarooMatschie's tree-kangaroo (Dendrolagus matschiei), also known as the Huon tree-kangaroo is
- Maui NuiMaui Nui is a modern geologists' name given to a prehistoric Hawaiian island and the corre
- Mawsonia (fish)Extinct genus of coelacanths
- Max BarclayBritish entomologist
- Max FürbringerMax Carl Anton Fürbringer (January 30, 1846 – March 6, 1920) was a German anatomist, known
- MaxomysMaxomys is a genus of rodents, widespread in Southeast Asia. They are mid-sized rodents, s
- MayflyAquatic insects of the order Ephemeroptera
- MazothairosExtinct insect genus
- Meadow pipitThe meadow pipit (Anthus pratensis) is a small passerine bird, which breeds in much of the
- MealwormSpecies of darkling beetle, larval form
- MealybugFamily of insects (Pseudococcidae)
- Meat antCommon Australian ant
- MecopteraOrder of insects
- MedeterinaeMedeterinae is a subfamily of flies in the family Dolichopodidae.
- Mediterranean house geckoSpecies of reptile
- Mediterranean monk sealSpecies of endangered mammal
- MedusozoaClade of marine invertebrates
- MeerkatSpecies of mongoose from Southern Africa
- MegacephaliniMegacephalini is a tribe of big-headed tiger beetles in the family Cicindelidae.
- MegaceropsExtinct genus of mammals
- MegachasmaMegachasma is a genus of mackerel sharks. It is usually considered to be the sole genus in
- MegachilidaeCosmopolitan family of bees
- MegafaunaLarge animals
- MegaherbivoreMegafauna subgroup
- MegalaimidaeFamily of birds
- MegalancosaurusMegalancosaurus is a genus of extinct reptile from the Late Triassic Dolomia di Forni Form
- MegalaniaExtinct species of giant monitor lizard
- MegalictisExtinct genus of carnivores
- MegalodonExtinct giant shark species
- MegalonyxExtinct genus of ground sloths
- MegalopteraOrder of insects
- MegalosaurusGenus of Jurassic-aged theropod dinosaur
- Megamouth sharkSpecies of shark
- MeganeuraExtinct genus of insects
- MeganeuropsisMeganeuropsis is an extinct genus of griffinfly, order Meganisoptera, known from the Early
- MegapodeFamily of birds
- MegarachneExtinct genus of eurypterid
- MegascolidesMegascolides is a genus of earthworms in the family Megascolecidae.
- Megaselia scalarisSpecies of fly
- MegatheriumGenus of extinct ground sloth
- MegazostrodonExtinct genus of mammaliaforms
- MeinertellidaeThe Meinertellidae are a small family of basal insects belonging to the order Archaeognath
- MeiolaniaExtinct genus of turtles
- MekosuchusExtinct genus of reptiles
- MelampittaFamily of birds
- MelanocharitidaeFamily of birds
- MelanoplusMelanoplus is a large genus of grasshoppers. They are the typical large grasshoppers (and
- MelanosomeA melanosome is an organelle found in animal cells and is the site for synthesis, storage
- MelieraxMelierax is a genus of bird of prey in the family Accipitridae. Established by George Robe
- MeliponaGenus of bees
- MelittinMelittin is the main component (40–60% of the dry weight) and the major pain-producing sub
- MellisuginiMellisugini is one of the three tribes that make up the subfamily Trochilinae in the hummi
- MelolonthaMelolontha is a genus of beetles in the family Scarabaeidae. The European cockchafers belo
- MelolonthinaeMelolonthinae is a subfamily of the scarab beetles (family Scarabaeidae). It is a very div
- MelolonthiniMelolonthini is a tribe of scarab beetles in the family Scarabaeidae. There are over 250 g
- MelomysMelomys is a genus of rodents in the family Muridae. Members of this genus live in the wet
- MelongenaMelongena is a genus of sea snails, marine gastropod mollusks in the family Melongenidae,
- MelongenidaeThe Melongenidae, the crown conchs and their relatives, are a taxonomic family of large to
- MelophagusMelophagus is a genus of flies in the family Hippoboscidae. All are wingless.
- Melophagus ovinusSpecies of fly
- MelyridaeFamily of beetles
- MembracinaeMembracinae is a subfamily of treehoppers in the family Membracidae. There are more than 4
- MenaspiformesMenaspiformes are an extinct order of holocephalans known from the Carboniferous and Permi
- MenhadenInformal name for some fishes (genera Brevoortia and Ethmidium)
- Menstruation (mammal)Periodic shedding of the uterine lining
- Mental protuberanceThe symphysis of the external surface of the mandible divides below and encloses a triangu
- MephitidaeFamily of mammals
- MerginiThe sea ducks (Mergini) are a tribe of the duck subfamily of birds, the Anatinae. The taxo
- MergusGenus of birds
- Meriones (rodent)Meriones is a rodent genus that includes the gerbil most commonly kept as a pet, Meriones
- MerlangiusSpecies of fish
- MeropachyinaeMeropachyinae is a subfamily of leaf-footed bugs in the family Coreidae. There are at leas
- MeropeidaeMeropeidae is a family of tiny scorpionflies within the order Mecoptera with only three kn
- MerycoidodontoideaExtinct superfamily of mammals
- MesadactylusMesadactylus ('mesa finger') is an extinct genus of pterosaur from the Kimmeridgian-Tithon
- MesiteFamily of birds
- MesobatrachiaThe Mesobatrachia (Ancient Greek μέσος (mésos, "middle") + batrachia ("frogs")) is a parap
- MesodapedonMesodapedon is an extinct genus of hyperodapedontid rhynchosaur from middle Triassic (Anis
- MesohippusExtinct genus of mammals
- MesolimulusMesolimulus is an extinct genus of horseshoe crab. The best known examples are found in So
- MesonychiaExtinct order of mammals
- MesonychidaeExtinct family of mammals
- MesoplodonGenus of beaked whales
- MesoraphidiidaeExtinct family of insects
- MesorhinosuchusMesorhinosuchus ("middle nose crocodile") is an extinct genus of basal phytosaur possibly
- MesosaurusExtinct genus of reptile from the early Permian of South Africa
- MesothelaeSuborder of spiders
- MesozoaSubkingdom of worm-like parasites of marine invertebrates
- Messor ibericusSpecies of harvester ant
- Messor structorSpecies of ant
- Metallic starlingThe metallic starling (Aplonis metallica), also known as the shining starling, is a bird i
- Metanephrops challengeriSpecies of crustacean
- Metaphycus helvolusSpecies of wasp
- MetatheriaClade of marsupials and close relatives
- Methyl eugenolChemical compound
- MetoponiinaeMetoponiinae is a subfamily of owlet moths in the family Noctuidae. There are about 16 gen
- MetriorhynchidaeExtinct family of reptiles
- Mexican free-tailed batSpecies of bat native to the Americas
- Michael S. EngelAmerican paleontologist and entomologist
- MicroatollA microatoll is a circular colony of coral, dead on the top but living around the perimete
- MicrobatesMicrobates is a bird genus in the family Polioptilidae. Its name means "small creeper" or
- MicrobiotheriaOrder of marsupials
- MicrocheraGenus of birds
- MicrocotyleMicrocotyle is a genus which belongs to the phylum Platyhelminthes and class Monogenea. Sp
- Microcotyle visaSpecies of worms
- MicrodictyonExtinct genus of lobopodian worm
- MicrofaunaMicroscopic animals and similar organisms
- MicromalthidaeMicromalthidae is an ancient family of small beetles belonging to the suborder Archostemat
- MicromyinaeMicromyinae is a subfamily of wood midges, insects in the family Cecidomyiidae. Its member
- MicropachycephalosaurusMicropachycephalosaurus (meaning "small thick-headed lizard") is an extinct genus of basal
- MicropeplinaeThe Micropeplinae are a subfamily of the Staphylinidae, rove beetles. Their antennae have
- MicroraptorExtinct genus of dinosaurs
- MicrosauriaExtinct order of tetrapods
- MicroscelisMicroscelis is a former genus of bulbuls described by George Robert Gray in 1840.
- Microspathodon bairdiiMicrospathodon bairdii, the bumphead damselfish, is a species of ray-finned fish from the
- MicrotiniMicrotini is a tribe of voles in the subfamily Arvicolinae.
- Middle Arctic tundraThe Canadian Middle Arctic Tundra ecoregion covers a broad stretch of northern Canada - th
- Middle JurassicSecond part of the Jurassic geological period, from 174 to 161 million years ago
- Middle spotted woodpeckerThe middle spotted woodpecker (Dendrocoptes medius) is a European woodpecker belonging to
- Middle TriassicSecond epoch of the Triassic period
- MidgeCommon name for several species of flies
- Midlands of South CarolinaThe Midlands region of South Carolina is the middle area of the state. The region's main c
- Midwife toadMidwife toads are a genus (Alytes) of frogs in the family Alytidae (formerly Discoglossida
- Migratory Bird Treaty1916 treaty between Canada and the United States
- Miklós KretzoiMiklós Kretzoi (9 February 1907 – 15 March 2005) was a Hungarian geologist, paleontologist
- MilesiiniThe Milesiini (or Xylotini) is a large and diverse tribe of hoverflies. They mimic wasps o
- MillardiaMillardia is a genus of rodent in the family Muridae native to South Asia and Myanmar. It
- MiltogramminaeThe Miltogramminae are a subfamily of the family Sarcophagidae. They are kleptoparasites o
- MimidFamily of birds
- MimusMimus is a bird genus in the family Mimidae. It contains the typical mockingbirds. In 2007
- Miniature horseVery small horse
- MiniopterusMiniopterus, known as the bent-winged or long winged bats, is the sole genus of the family
- MinkMammal in the family Mustelidae
- Minke whaleSpecies of whale
- MinnowCommon name for a number of species of small freshwater fish
- MiobaptusMiobaptus is a fossil genus of grebe that is known from several specimens collected from C
- MiodytesMiodytes is a fossil genus of grebe known from a nearly complete specimen from Valjevo Bas
- MiracinonyxExtinct genus of mammal
- MirandornithesTaxon of birds
- MiridaeThe Miridae are a large and diverse insect family at one time known by the taxonomic synon
- MiriniMirini is a tribe of plant bugs belonging to the subfamily Mirinae.
- Mirror testAnimal self-awareness test
- Misgurnus fossilisSpecies of fish
- Missing link (human evolution)Non-scientific term for a transitional fossil
- Mitochondrial EveMatrilineal most recent common ancestor of all living humans
- MitsukurinaMitsukurina is a genus of mackerel shark in the family Mitsukurinidae. It contains one ext
- Mitu (bird)Mitu is a genus of curassows, large birds in the family Cracidae. They are found in humid
- Miyajima Public AquariumMiyajima Public Aquarium (宮島水族館, Miyajima Suizokukan) is an aquarium on the island of Itsu
- Mo (Chinese zoology)Chinese name for giant panda and tapir
- Moa-naloExtinct tribe of birds
- Mobbing (animal behavior)Attack on a predator by prey species
- Modes of reproductionWays animals produce their young
- MoeritheriumExtinct genus of mammals
- MoggyInformal name for a non-pedigree cat
- MohoidaeExtinct family of birds
- Molar (tooth)Large tooth at the back of the mouth
- Mole salamanderGenus of amphibians
- MolgulaGenus of tunicates
- Moluccan eclectusSpecies of bird
- MomotusMomotus is a small genus of the motmots, a family of near passerine birds found in forest
- MonachinaeSubfamily of carnivores
- MonacoaMonacoa is a genus of fish in the family Opisthoproctidae found in Atlantic and Pacific Oc
- Monarch butterflyMilkweed butterfly in the family Nymphalidae
- Monarch butterfly migrationMigrations, mainly across North America
- Monarch flycatcherFamily of birds
- MonasaMonasa is a genus of puffbirds in the Bucconidae family.
- Monetaria monetaMonetaria moneta, common name the money cowrie, is a species of small sea snail, a marine
- MongolestesMongolestes ("Mongolian robber") is an extinct genus of mesonychid known from the 'Ulan Go
- Mongolian gerbilSpecies of mammal
- MongolostegusMongolostegus (meaning "Mongolian roof") is a genus of stegosaur from the Early Cretaceous
- Mongoose lemurThe mongoose lemur (Eulemur mongoz) is a small primate in the family Lemuridae, native to
- MongrelDog of mixed breeds
- Moniezia expansaMoniezia expansa is commonly known as sheep tapeworm or double-pored ruminant tapeworm. It
- Monitor lizardGenus of reptiles
- MonjurosuchusMonjurosuchus is a genus of choristoderan reptile that lived in what is now China and Japa
- Monk sealTribe of earless seals
- Monkey hateMonkey hate is a form of zoosadism where humans have a hatred for monkeys, particularly ma
- Monkeyland Primate SanctuaryMonkeyland is a free roaming, multi-species primate sanctuary founded in 1998 by Tony Blig
- Monocesta coryliMonocesta coryli, the larger elm leaf beetle, is a species of skeletonizing leaf beetle in
- MonodontidaeFamily of mammals
- Monogamy in animalsNatural history of mating systems in which species pair bond to raise offspring
- MonogeneaClass of ectoparasitic flatworms
- MonogonontaMonogononta is a class of rotifers, found mostly in freshwater but also in soil and marine
- MonomoriumMonomorium is a genus of ants in the subfamily Myrmicinae. As of 2013 it contains about 39
- MonoplacophoraClass of molluscs
- Monotypic taxonTaxonomic group with only one subordinate taxon
- MoonratSpecies of mammal in the Erinaceidae family
- MoorhenGenus of birds
- Moorish idolSpecies of fish
- Moray eelFamily of fishes
- MoreporkSpecies of owl
- MorganucodonEarly mammaliaform genus of the Triassic and Jurassic periods
- MorganucodontaExtinct order of mammaliaforms
- Mormon cricketSpecies of cricket-like animal
- MormyridaeFamily of ray-finned fishes
- Morpho (genus)Genus of brush-footed butterflies
- Morpho didiusMorpho didius, the giant blue morpho, is a Neotropical butterfly belonging to the subfamil
- Morphology of DipteraPhysical features of insect order Diptera
- Morten Thrane BrünnichMorten Thrane Brünnich (30 September 1737 – 19 September 1827) was a Danish zoologist and
- Mosaic evolutionMosaic evolution (or modular evolution) is the concept, mainly from palaeontology, that ev
- MosasaurExtinct marine lizards of the Late Cretaceous
- MosasaurusExtinct genus of marine lizard from the Late Cretaceous
- MoschidaeFamily of mammals belonging to even-toed ungulates
- MoschiolaMoschiola, the spotted chevrotains, are a genus of small even-toed ungulates in the family
- MoschopsExtinct genus of therapsids that lived in the Guadalupian epoch
- MotacillidaeFamily of birds
- MotmotFamily of birds
- MouflonSpecies group of the wild sheep
- Mountain beaverSpecies of the genus Aplodontia
- Mountain bulbulThe mountain bulbul (Ixos mcclellandii) is a songbird species in the bulbul family, Pycnon
- Mountain goatSpecies of mammal
- Mountain gorillaSubspecies of the eastern gorilla
- Mountain wagtailThe mountain wagtail (Motacilla clara), also known as the long-tailed wagtail or grey-back
- Mountain zebraSpecies of zebra
- Mourning collared doveThe mourning collared dove or African mourning dove (Streptopelia decipiens) is a dove whi
- Mourning doveNorth American bird in the family Columbidae
- MousebirdOrder of birds
- MouthbrooderMouthbrooding, also known as oral incubation and buccal incubation, is the care given by s
- MT-RNR2Mitochondrially encoded 16S RNA (often abbreviated as 16S) is the mitochondrial large subu
- Mucrospirifer mucronatusMucrospirifer mucronatus is a species of articulate brachiopod from the middle Devonian. T
- MudskipperSubfamily of fish
- Mugger crocodileSpecies of crocodile from Asia
- Mule deerDeer indigenous to western North America
- Mullus barbatusMullus barbatus (red mullet) is a species of goatfish found in the Mediterranean Sea, Sea
- MultituberculataExtinct order of mammals
- Munidopsis serricornisMunidopsis serricornis is a species of squat lobster. It is widely distributed in the worl
- MuntjacGenus of deer
- MuricidaeFamily of molluscs
- MurinaeSubfamily of rodents
- Murine typhusMurine typhus, also known as endemic typhus or flea-borne typhus, is a form of typhus tran
- MuroideaSuperfamily of rodents
- Murray codAustralian predatory freshwater fish
- Mus (genus)Genus of rodents
- MuscoideaMuscoidea is a superfamily of flies in the subsection Calyptratae. Muscoidea, with approxi
- Muscovy duckSpecies of bird
- Muscular hydrostatA muscular hydrostat is a biological structure found in animals. It is used to manipulate
- Muséum de ToulouseNatural history museum in Toulouse, France
- Museum of the RockiesMuseum of the Rockies is a museum in Bozeman, Montana. Originally affiliated with Montana
- Museum WiesbadenThe Museum Wiesbaden is a two-branch museum of art and natural history in the Hessian capi
- Musk deerGenus of mammals
- MuskellungeSpecies of fish
- MusselBivalve mollusc
- MussidaeMussidae is a family of stony coral in the order Scleractinia. Following a taxonomic revis
- MustangFree-roaming horse of the Western US
- MusthCondition in male elephants
- MV SeashellSeashell was a 312 GRT coaster that was built in 1943 by Lidingö Nya Varv & Vaerkstaeder,
- MycetophilidaeMycetophilidae is a family of small flies, forming the bulk of those species known as fung
- MycteropsMycterops is a genus of prehistoric eurypterid of the family Mycteroptidae. Mycterops live
- MycteroptidaeMycteroptidae are a family of eurypterids, a group of extinct chelicerate arthropods commo
- MyctophiformesOrder of fishes
- Myctophum punctatumMyctophum punctatum is a species of mesopelagic fish in the family Myctophidae. Its common
- MyledaphusMyledaphus is an extinct genus of guitarfish. It currently contains four valid species fou
- MyllokunmingiaMyllokunmingia is a genus of basal chordate from the Lower Cambrian Maotianshan shales of
- MynaCommon name for several species of birds
- Myotis septentrionalisSpecies of mammal
- MyotomysMyotomys is a genus of African Karoo rats that inhabit the Karoo, a semi-desert region in
- Myrmecia (ant)Genus of ants
- MyrmeciinaeSubfamily of ants
- MyrmecinaMyrmecina is a genus of ants in the subfamily Myrmicinae. It contains 53 species distribut
- MyrmecologyStudy of ants
- Myrmeconema neotropicumSpecies of roundworm
- MyrmeleontiformiaMyrmeleontiformia is an insect clade in the order Neuroptera, and which was historically t
- MyrmicinaeSubfamily of ants with cosmopolitan distribution whose pupae do not create cocoons
- MyrmoterasMyrmoteras is a genus of ants in the subfamily Formicinae and the sole member of the tribe
- MyrmotheraMyrmothera is a genus of birds belonging to the antpitta family Grallariidae that are foun
- MystiornisMystiornis is an extinct genus of bird which existed in what is now western Siberia, Russi
- MystriosaurusMystriosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic (To
- Mytilus (bivalve)Mytilus is a cosmopolitan genus of medium to large-sized edible, mainly saltwater mussels,
- MyxomatosisRabbit disease caused by Myxoma virus
- MyxophagaSuborder of beetles
- MyxozoaSubphylum of aquatic parasites
- Myzus persicaeAphid of peach, potato, other crops
