- Abelisaurus
- Abyssal rainbow gar
- Acanthostega
- Achaenodon
- Achelousaurus
- Acheroraptor
- Achillobator
- Acrocanthosaurus
- Acrophoca
- Adalatherium
- Adapis
- Adzebill
- Aegicetus
- Aegirocassis
- Aegisuchus
- Aelurodon
- Aepycamelus
- Aerotitan
- Aetiocetus
- Aetodactylus
- Afradapis
- African Deinotherium
- African blue day gecko
- African gray wolf
- African lemur
- African mammoth
- African ruffle
- African silver bat
- Afrocentrosaurus
- Afrotapejara
- Agogwe
- Agriotherium
- Agrithinosaurus
- Agumon
- Ahool
- Ahytherium
- Aigialosaurus
- Ailurarctos
- Ailuropoda baconi
- Ailuropoda microta
- Ailurotherium
- Aivukus
- Akada
- Aktautitan
- Aktiogavialis
- Alamodactylus
- Alamosaurus
- Alaotra grebe
- Alaskan chalico
- Alaskan therizinosaur
- Alastor's hornhead
- Albadraco
- Albanerpeton
- Albertaceratops
- Albertosaurus
- Albino spider
- Alca carolinensis
- Alca minor
- Alca stewarti
- Alcione
- Aldabra brush warbler
- Aldabrachampsus
- Aldabrachelys abrupta
- Aldabrachelys grandidieri
- Aletopelta
- Alexornis
- Algae carp
- Alligator prenasalis
- Allocompsognathus
- Allodaposuchus
- Allodesmus
- Allognathosuchus
- Allosaurus V1
- Alopecoid fox
- Alphadon
- Alpine Spaniel
- Amargasaurus V1
- Amargasaurus V2
- Ambopteryx
- Ambulocetus
- Ameranthropoides loysi
- American Atlas moth
- American aardvark
- American aardwolf
- American adjutant
- American ape lemur
- American argus
- American aye-aye
- American babirusa
- American baboon lemur
- American bald lemur
- American bamboo lemur
- American banana
- American banded flower mantis
- American baobob
- American bar-headed goose
- American bearded barbet
- American bearded vulture
- American bee-eater
- American bharal
- American bird-of-paradise
- American black-masked blue pigeon
- American black treepie
- American bleeding-heart
- American blue duck
- American blue magpie
- American blue tarantula
- American bottlebrush
- American bowerbird
- American broad-billed parrot
- American brown crested pigeon
- American brown stick insect
- American brushfinch
- American bushbaby
- American butcherbird
- American capercaillie
- American capuchin lemur
- American chamois
- American cheetah
- American chevrotain
- American chough
- American civet
- American cockatoo
- American colobus lemur
- American common flower mantis
- American common magpie
- American common shelduck
- American coua
- American coucal
- American crab-eating frog
- American crested crane
- American crested porcupine
- American crested shag
- American crowned eagle
- American crowned pigeon
- American cuckoo
- American devil lemur
- American drongo
- American dwarf moa
- American edible dormouse
- American elaphure
- American elephant
- American emerald dove
- American fairy-bluebird
- American false bottlebrush
- American fat-tailed lemur
- American file snake
- American fishing cat
- American flightless rail
- American flying dragon
- American flying frog
- American flying snake
- American forest tern
- American fork-marked lemur
- American fossa
- American frilled lizard
- American fruit dove
- American gerbil
- American gharial
- American giant ant
- American giant fruit bat
- American giant horse
- American giant moth
- American giant softshell turtle
- American giant squirrel
- American gibbon
- American giraffe bird
- American glass catfish
- American golden jackal
- American goral
- American gorilla lemur
- American green magpie
- American grey crested pigeon
- American grey goose
- American grey treepie
- American greylag goose
- American griffon vulture
- American guineafowl
- American gundi
- American hamster
- American harrier-hawk
- American harvester termite
- American hawk-owl
- American hog-nosed bat
- American hog deer
- American honey badger
- American honeyguide
- American hoopoe
- American house crow
- American howler lemur
- American ibex
- American imperial pigeon
- American indri
- American jackdaw
- American jerboa
- American jumping rat
- American junglefowl
- American kagu
- American kangaroo
- American kelpie
- American king cobra
- American koala
- American koala lemur
- American kookaburra
- American langur lemur
- American laughingthrush
- American leaf lemur
- American leafbird
- American lesser rhinoceros
- American lion
- American lion-tailed lemur
- American long-legged goshawk
- American lorikeet
- American loris
- American lourie
- American lyrebird
- American magpie-lark
- American malkoha
- American mandrill
- American markhor
- American marmoset lemur
- American marsupial pterodactyl
- American mastodon
- American mawile
- American megapode
- American megastick
- American monal
- American mongoose
- American mouflon
- American mountain cat
- American mountain deer
- American mountain parrot
- American mousebird
- American munia
- American muntjac
- American musk deer
- American oakleaf butterfly
- American openbill
- American orchid mantis
- American ostrich
- American otter shrew
- American oxpecker
- American painted finch
- American pangolin
- American paradise flycatcher
- American patas lemur
- American peacock-pheasant
- American pheasant pigeon
- American pied crow
- American pied shag
- American pig-nosed turtle
- American pig-tailed lemur
- American pinkleg tarantula
- American pitta
- American platypus
- American pond turtle
- American pouched rat
- American proboscis lemur
- American purple frog
- American pygmy goose
- American raccoon dog
- American rainbow stick insect
- American red-fronted squirrel
- American red shelduck
- American redknee tarantula
- American ringed flower mantis
- American river lion
- American river ratfish
- American river seal
- American river tern
- American rock rat
- American roller
- American roofed turtle
- American rook
- American rose mantis
- American rosella
- American sambar deer
- American saola
- American scaly-tailed flying squirrel
- American serow
- American shama
- American sheldgoose
- American shoebill
- American short-crested lemur
- American sifaka
- American sloth bear
- American sloth lemur
- American small-clawed otter
- American snouted termite
- American snow sheep
- American socialbird
- American sooty owl
- American spider lemur
- American spinebill
- American spiny flower mantis
- American spiny stick insect
- American spitting cobra
- American spoonbill
- American sportive lemur
- American spotted hyena
- American springhare
- American stink badger
- American stripe-throated moa
- American striped polecat
- American sun bear
- American swamp squirrel
- American tahr
- American takin
- American tamarin lemur
- American tenrec
- American tentacled snake
- American tiger
- American tomato frog
- American tragopan
- American tree-kangaroo
- American tree lobster
- American tufted deer
- American tusked rhinoceros
- American upside-down catfish
- American vampire finch
- American vanga
- American vervet lemur
- American vontsira
- American warthog
- American water deer
- American water frog
- American weaver
- American whale boar
- American whistling tarantula
- American white-necked blue pigeon
- American widowbird
- American wood hoopoe
- American wood nymph
- American wood pigeon
- American woodswallow
- American woolly lemur
- American woolly rhinoceros
- American woolly therizinosaur
- American yak
- American yellow-spotted climbing toad
- American zebra mouse
- American zebra tarantula
- Americindricotherium
- Ammonite
- Ammutosaurus
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