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- Aardvark
- Aardwolf
- Abalone
- Abyssinian cat
- Abyssinian ground hornbill
- Acacia rat
- Achilles tang
- Acorn barnacle
- Acorn weevil
- Acorn woodpecker
- Acouchi (rodent resembling a squirrel)
- Adams stag-horned beetle
- Addax
- Adder
- Adelie penguin
- Admiral
- Admiral butterfly
- Adouri
- African augur buzzard
- African bush viper
- African civet
- African clawed frog
- African elephant
- African fish eagle
- African golden cat
- African ground hornbill
- African harrier hawk
- African hornbill
- African jacana
- African mole snake
- African paradise flycatcher
- African pied kingfisher
- African porcupine
- African rock python
- African wild cat
- African wild dog
- Agama
- Agouta (rodent resembling a mouse)
- Agouti (rodent resembling a squirrel)
- Airedale
- Aisan pied starling
- Akita Inu
- Alabama map turtle
- Alaska jingle
- Alaskan husky
- Alaskan malamute
- Albacore tuna
- Albatross
- Albertosaurus
- Albino
- Aldabra tortoise
- Allens big-eared bat
- Alligator
- Alligator gar
- Alligator snapping turtle
- Allosaurus
- Alpaca
- Alpine black swallowtail butterfly
- Alpine goat
- Alpine road guide tiger beetle
- Altiplano chinchilla mouse
- Amazon dolphin
- Amazon parrot
- Amazon tree boa
- Amber pen shell
- American alligator
- American avocet
- American badger
- American bittern
- American black vulture
- American cicada
- American crayfish
- American crocodile
- American crow
- American goldfinch
- American kestrel
- American lobster
- American marten
- American ratsnake
- American red squirrel
- American river otter
- American robin
- American toad
- American wigeon
- Amethyst gem clam
- Amethyst sunbird
- Amethystine python
- Ammonite
- Amoeba
- Amphibian
- Amphiuma
- Amur minnow
- Amur ratsnake
- Amur starfish
- Anaconda
- Anchovy
- Andean cat
- Andean cock-of-the-rock
- Andean condor
- Anemone
- Anemone crab
- Anemone shrimp
- Angel wing mussel
- Angelfish
- Anglerfish
- Angora
- Angwantibo
- Anhinga
- Animated
- Ankole
- Ankole-watusi
- Annas hummingbird
- Annelida
- Annelid
- Anole
- Anopheles
- Antarctic fur seal
- Antarctic giant petrel
- Anteater
- Antelope
- Antelope ground squirrel
- Antipodes green parakeet
- Ant
- Ant bear
- Ant lion
- Anura
- Aoudad
- Apatosaur
- Ape
- Aphid
- Apis dorsata laboriosa
- Aplomado falcon
- Aquatic leech
- Arabian horse
- Arabian oryx
- Arabian wild cat
- Aracari
- Arachnid
- Arawana
- Archaeocete
- Archaeopteryx
- Archer fish
- Arctic fox
- Arctic hare
- Arctic wolf
- Argali
- Argentine horned frog
- Argentine ruddy duck
- Argus fish
- Ariel toucan
- Arizona alligator lizard
- Ark shell
- Armadillo
- Armed crab
- Armed nylon shrimp
- Army ant
- Arrow crab
- Arrow worm
- Arrowana
- Arthropods
- Aruanas
- Asian constable butterfly
- Asian damselfly
- Asian elephant
- Asian lion
- Asian porcupine
- Asian small-clawed otter
- Asian trumpetfish
- Asian water buffalo
- Asiatic greater freshwater clam
- Asiatic lesser freshwater clam
- Asiatic mouflon
- Asiatic wild ass
- Asp
- Ass
- Assassin bug
- Astarte
- Astrangia coral
- Atlantic black goby
- Atlantic blue tang
- Atlantic ridley turtle
- Atlantic sharpnose puffer
- Atlantic spadefish
- Atlas moth
- Attwater's prairie chicken
- Auk
- Auklet
- Aurochs
- Australian curlew
- Australian freshwater crocodile
- Australian fur seal
- Australian kestrel
- Australian shelduck
- Australian Silky Terrier
- Avocet
- Axis deer
- Axolotl
- Aye-aye
- Aztec ant
- Azure-winged magpie
- Azure vase
- Babirusa
- Baboon
- Bactrian
- Badger
- Bagworm
- Baiji
- Bald eagle
- Baleen whale
- Balloonfish
- Bandicoot
- Banteng
- Barasinga
- Barasingha
- Barb
- Barbet
- Barnacle
- Barracuda
- Basilisk
- Bass
- Basset hound
- Bat
- Beagle
- Bear
- Bearded dragon
- Beaver
- Bee
- Beetle
- Bell frog
- Beluga whale
- Bettong
- Big-horned sheep
- Bighorn
- Bilby
- Binturong
- Bird
- Bird of Paradise
- Bison
- Bittern
- Black Bear
- Black fly
- Black panther
- Black rhino
- Black widow spider
- Blackbird
- Blackbuck
- Blesbok
- Blowfish
- Blue jay
- Blue whale
- Bluebird
- Bluebottle
- Bluefish
- Boa
- Boa constrictor
- Boar
- Bobcat
- Bobolink
- Bobwhite
- Bongo
- Booby
- Boto
- Boubou
- Boutu
- Bovine
- Brahman bull
- Brahman cow
- Brant
- Bream
- Brocket deer
- Bronco
- Brontosaurus
- Brown Bear
- Bubblefish
- Buck
- Budgie
- Bufeo
- Buffalo
- Bufflehead
- Bug
- Bull mastiff
- Bullfrog
- Bumblebee
- Bunny
- Bunting
- Burro
- Bush Baby
- Bush squeaker
- Bustard
- Butterfly
- Buzzard
- Caecilian
- Caiman
- Caiman lizard
- Calf
- Camel
- Canary
- Canine
- Canvasback
- Cape ghost frog
- Capybara
- Caracal
- Cardinal
- Caribou
- Carp
- Cassowary
- Cat
- Catbird
- Caterpillar
- Catfish
- Cattle
- Caudata
- Cavy
- Centipede
- Chafer
- Chameleon
- Chamois
- Cheetah
- Chevrotain
- Chick
- Chickadee
- Chicken
- Chihuahua
- Chimney swift
- Chimpanzee
- Chinchilla
- Chinese crocodile lizard
- Chipmunk
- Chital
- Chrysomelid
- Chuckwalla
- Chupacabra
- Cicada
- Cirriped
- Civet
- Clam
- Cleaner wrasse
- Clown anemone fish
- Clumber
- Coati
- Cob
- Cobra
- Cockatiel
- Cockatoo
- Cocker spaniel
- Cockroach
- Cod
- Coelacanth
- Collard lizard
- Colt
- Comet
- Conch
- Condor
- Coney
- Conure
- Coot
- Cooter
- Copepod
- Copperhead
- Coqui
- Coral
- Cormorant
- Corn snake
- Corydoras Catfish
- Cottonmouth
- Cottontail
- Cougar
- Cow
- Cowbird
- Cowrie
- Coyote
- Coypu
- Crab
- Crane
- Crayfish
- Cricket
- Crocodile
- Crocodile skink
- Crossbill
- Crow
- Crown-of-thorns starfish
- Crustacean
- Cub
- Cuckoo
- Curassow
- Curlew
- Cuscus
- Cusimanse
- Cuttlefish
- Dachshund
- Daddy longlegs
- Dairy cow
- Dalmatian
- Damselfly
- Dandie Dinmont Terrier
- Dart frog
- Dassie
- Dassies
- Dassie rat
- Deer
- Deer mouse
- Degu
- Degus
- Desert pupfish
- Deinonychus
- Devil fish
- Devil Tasmanian
- Diaea Dorsata
- Diamondback rattlesnake
- Dik-Dik, Dikkops bird
- Dingo
- Dinosaur
- Diplodocus
- Dipper
- Discus
- Doberman pinscher
- Doctorfish
- Dodo bird
- Doe
- Dog
- Dogue de Bordeaux
- Dogwood Clubgall
- Dogwood Twig Borer
- Dolphin
- Donkey
- Dorado
- Dore
- Dorking
- Dormouse
- Dotterel
- Douglas fir bark beetle
- Dove
- Dowitcher
- Draft horse
- Dragon
- Dragonfly
- Drake
- Dromedary
- Drongo
- Duck
- Duckbill platypus
- Duckling
- Dugong
- Duiker
- Dung beetle
- Dungeness crab
- Dunlin
- Dunnart
- Dwarf mongoose
- Eagle
- Earthworm
- Echidna
- Eel
- Eeve
- Eft
- Egret
- Eider
- Eidolon helvum
- Ekaltadeta
- Eland
- Electric Eel
- Elephant
- Elk
- Elver
- Emu
- Ermine
- Erne
- Esok
- Ewe
- Eyas
- Eyra
- elephant
- Fairy Bluebird
- Fairy Flies
- Fairy Fly
- Falcon
- Fallow deer
- Fan worms
- Fantail
- Fat-tailed dunnart
- Fawn
- Felid
- Felidae
- Feline
- Fennec Fox
- Ferret
- Fiddler crab
- Field mouse
- Fin whale
- Finch
- Fire bellied toad
- Firefly
- Fish
- Flamingo
- Flatfish
- Flea
- Flicker
- Flickertail squirrel
- Flies
- Flounder
- Fluke
- Fly
- Flycatcher
- Flying Fox
- Flying lemur
- Flying squirrel
- Foal
- Fossa
- Fowl
- Fox
- Frigate bird
- Frilled lizard
- Frog
- Frogmouth
- Fruit bat
- Fugu
- Fulmar
- Funnel weaver spider
- Fur seal
- Gadwall
- Galago
- Galah
- Galapagos albatross
- Galapagos dove
- Galapagos hawk
- Galapagos mockingbird
- Galapagos penguin
- Galapagos sea lion
- Galapagos tortoise
- Gallinule
- Gander
- Gannet
- Gar
- Gaur
- Gavial
- Gazelle
- Gecko
- Geese
- Gelada
- Gemsbok
- Gemsbuck
- Gerbil
- Gerenuk
- German shepherd
- Gharial
- Gibbon
- Gila monster
- Giraffe
- Glassfrog
- Globefish
- Gnatcatcher
- Gnat
- Gnu
- Goa
- Goat
- Godwit
- Goitered
- Goldeneye
- Golden Retriever
- Goldfinch
- Goldfish
- Goose
- Goosefish
- Gopher
- Gorilla
- Goshawk
- Gosling
- Grackle
- Grass spider
- Grasshopper
- Grayling
- Gray fox
- Gray wolf
- Great argus
- Grebe
- Greyhound dog
- Grison
- Grizzly bear
- Grosbeak
- Groundhog
- Grouse
- Grunion
- Guanaco
- Guib
- Guillemot
- Guinea fowl
- Guinea pig
- Gull
- Guppy
- Gyrfalcon
- Hackee
- Haddock
- Hadrosaurus
- Hag-fish
- Hairstreak
- Hake
- Halcyon
- Halibut
- Halicore
- Hamadryad
- Hamadryas
- Hammerhead bird
- Hammerhead shark
- Hammerkop
- Hamster
- Hanuman-monkey
- Hapuka
- Hapuku
- Harbor-porpoise
- Harbor-seal
- Hare
- Harp-seal
- Harpy-eagle
- Harrier
- Harrier Hawk
- Hart
- Hartebeest
- Harvest mouse
- Harvestmen
- Hatchet-fish
- Hawaiian-monk seal
- Hawk
- Hector's dolphin
- Hedgehog
- Heifer
- Hellbender
- Hen
- Herald
- Hercules-beetle
- Hermit crab
- Heron
- Herring
- Heterodontosaurus
- Hind
- Hippo
- Hippopotamus
- Hoatzin
- Hochstetter's frog
- Hog
- Hogget
- Hoiho
- Hoki
- Homalocephale
- Honey-badger
- Honeybee
- Honey-creeper
- Honeyeater
- Hoopoe
- Horn-shark
- Horned-toad
- Horned-viper
- Hornbill
- Hornet
- Horse
- Horsefly
- Horseshoe bat
- Horseshoe crab
- Hound
- House-mouse
- Housefly
- Howler-monkey
- Huemul (deer)
- Huia
- Human
- Hummingbird
- Humpback whale
- Husky
- Hydatid-tapeworm
- Hydra
- Hyena
- Hylaeosaurus
- Hypacrosaurus
- Hypsilophodon
- Hyracotherium
- Hyrax
- Ibex
- Ibis
- Ichthyosaurs
- Iguana
- Iguanodon
- Impala
- Imperator angel
- Imperial eagle
- Indian elephant
- Insects
- Intermediate egret
- Iriomote cat
- Irukandji jellyfish
- Isopod
- Ivory-billed woodpecker
- Jabiru
- Jackal
- Jackrabbit
- Jaeger
- Jaguar
- Jaguarundi
- Janenschia
- Jay
- Jellyfish
- Jenny
- Jerboa
- Joey
- John dory
- Junco
- June bug
- Kagu (bird)
- Kakapo (flightless greybilled owl-like parrot)
- Kakarikis
- Kangaroo
- Karakul
- Katydid
- Kawala
- Kentrosaurus
- Kestrel
- Kid
- Killdeer
- Killer Whale
- Killifish
- Kingbird
- Kingfisher
- Kinglet
- Kingsnake
- Kinkajou
- Kiskadee
- Kit Fox
- Kite
- Kitten
- Kittiwake
- Kitty
- Kiwi (bird)
- Koala
- Koala bear
- Kob (African antelope)
- Kodiak bear
- Koi
- Komodo dragon
- Koodoo
- Kookaburra
- Kouprey
- Krill
- Kronosaurus
- Kudu
- Kusimanse
- Labrador Retriever
- Ladybird
- Ladybug
- Lamb
- Lamprey
- Langur
- Lark
- Laughingthrush
- Leafbird
- Leafhopper
- Leafwing
- Leech
- Lemming
- Lemur
- Leonberger
- Leopard
- Leopard Seal
- Leveret
- Lhasa Apso
- Lice
- Liger
- Lightningbug
- Limpet
- Limpkin
- Ling
- Lion
- Lionfish
- Lizard
- Llama
- Lobo
- Lobster
- Locust
- Logger head turtle
- Longhorn
- Longspur
- Loon
- Lorikeet
- Loris
- Louse
- Lovebird
- Lowchen
- Lungfish
- Lynx
- Macaque
- Macaw
- Macropod
- Madagascar hissing roach
- Magpie
- Maiasaura
- Majungatholus
- Malamute
- Mallard
- Maltese dog
- Mamba
- Mamenchisaurus
- Mammal
- Mammoth
- Manatee
- Mandrill
- Mangabey
- Manta
- Manta ray
- Mantis
- Mantis ray
- Manx cat
- Mara
- Marabou
- Marbled Murrelet
- Mare
- Marlin
- Marmoset
- Marmot
- Marten
- Martin
- Massasauga
- Massospondylus
- Mastiff
- Mastodon
- Meadowlark
- Meerkat
- Megalosaurus
- Megalotomus quinquespinosus
- Megaraptor
- Merganser
- Merlin
- Mice
- Microvenator
- Midge
- Milksnake
- Millipede
- Minibeast
- Mink
- Minnow
- Mite
- Moa
- Mockingbird
- Mole
- Mollies
- Mollusk
- Molly
- Monarch
- Mongoose
- Monkey
- Monkfish
- Monoclonius
- Montanoceratops
- Moorhen
- Moray
- Moray eel
- Moose
- Mosasaur
- Mosquito
- Moth
- Motmot
- Mouflon
- Mountain cat
- Mountain lion
- Mouse
- Mousebird
- Mouse/Mice
- Mud puppy
- Mule
- Mullet
- Muntjac
- Murrelet
- Musk ox
- Muskrat
- Mussaurus
- Mussel
- Mustang
- Myna
- Mynah
- Myotis
- Nabarlek
- Nag
- Naga
- Nagapies
- Naked mole rat
- Nandine
- Nandoo
- Nandu
- Narwhal
- Narwhale
- Natterjack Toad
- Nauplius
- Nautilus
- Needle fish
- Needletail
- Nematode
- Nene
- Neon blue guppy
- Neon blue hermit crab
- Neon dwarf gourami
- Neon rainbow fish
- Neon red guppy
- Neon Tetra
- Nerka
- Nettlefish
- Newfoundland dog
- Newt
- Newt Nutria
- Night crawler
- Night heron
- Nighthawk
- Nightingale
- Nightjar
- Nijssenis's dwarf chihlid
- Nilgai
- Nine banded armadillo
- Noctilio
- Noctule
- Noddy
- Noolbenger
- Northern cardinals
- Northern elephant seal
- Northern flying squirrel
- Northern fur seal
- Northern hairy-nosed wombat
- Northern pike
- Northern sea horse
- Northern spotted owl
- Norway lobster
- Norway rat
- Nubian goat
- Nudibranch
- Numbat
- Nurse shark
- Nutcracker
- Nuthatch
- Nutria
- Nyala
- Nymph
- Ocelot
- Octopus
- Okapi
- olingo
- Olm
- Opossum
- Orangutan
- Orca
- Oriole
- Oropendola
- Oropendula
- Oryx
- Osprey
- Ostracod
- Ostrich
- Otter
- Ovenbird
- Owl
- Ox
- Oxen
- Oxpecker
- Oyster
- Ozark big-eared bat
- Paca
- Pacific Parrotlet
- Paddlefish
- Panda
- Pangolin
- Panther
- Papillon
- Parakeet
- Parrot
- Partridge
- Peacock
- Peafowl
- Peccary
- Pekingese
- Pelican
- Pelicinus Petrel
- Penguin
- Perch
- Peregrine falcon
- Pewee
- Phalarope
- Pharaoh hound
- Pheasant
- Phoebe
- Phoenix
- Pig
- Pigeon
- Piglet
- Pika
- Pike
- PikePerch
- Pilchard
- Pine marten
- Pink river dolphin
- Pinniped
- Pintail
- Pipistrelle
- Pipit
- Piranha
- Pit bull
- Pitta bird
- Plain squeaker
- Plankton
- Platypus
- Plover
- Polar bear
- Polecat
- Polliwog
- Polyp
- Polyturator
- Pomeranian
- Pony
- Poodle
- Porcupine
- Porpoise
- Portuguese man of war
- Possum
- Prairie dog
- Prawn
- Praying Mantis
- Primate
- Pronghorn
- Pseudodynerus quadrisectus
- Ptarmigan
- Pterodactyls
- Pterosaurs
- Puffer
- Puffer fish
- Puffin
- Pug
- Pullet
- Puma
- Pup fish
- Puppy
- Purple marten
- Pygmy
- Python
- Quadrisectus
- Quagga
- Quahog
- Quail
- Queen Alexandra's birdwing
- Queen ant
- Queen bee
- Queen conch
- Queen snake
- Queensland grouper
- Queensland heeler
- Quelea
- Quetzal
- Quetzalcoatlus
- Quillback
- Quinquespinosus
- Quokka
- Quoll
- Rabbit
- Rabid squirrel
- Raccoon
- Racer
- Racerunner
- Ragfish
- Rail
- Rainbow fish
- Rainbow lorikeet
- Rainbow trout
- Ram
- Raptors
- Rasbora
- Rat
- Rat fish
- Rattail
- Rattlesnake
- Raven
- Ray
- Red-tailed hawk
- Redhead
- Redheaded woodpecker
- Redpoll
- Redstart
- Reindeer
- Reptile
- Reynard
- Rhea
- Rhesus monkey
- Rhino
- Rhinoceros
- Rhinoceros beetle
- Rhodesian Ridgeback
- Ring tailed lemur
- Ringworm
- Rio Grande escuerzo
- Roach
- Roadrunner
- Roan
- Robin
- Rock rat
- Rodent
- Roebuck
- Roller
- Rook
- Rooster
- Rottweiler
- Sable
- Sable Antelope
- Sablefish
- Saiga
- Saki monkey
- Salamander
- Salmon
- Salt water crocodile
- Sambar
- Samoyed dog
- Sand dollar
- Sandbar shark
- Sanderling
- Sandpiper
- Sapsucker
- Sardine
- Sawfish
- Scallop
- Scarab
- Scarlet ibis
- Scaup
- Schapendoes
- Schipperke
- Schnauzer
- Scorpion
- Scoter
- Screamer
- Sea hog
- Seahorse
- Sea lion
- Sea monkey
- Sea Slug
- Sea urchin
- Seabird
- Seagull
- Seal
- Senegal python
- Seriema
- Serpent
- Serval
- Shark
- Shearwater
- Sheep
- Sheldrake
- Shelduck
- Shiba inu
- Shih Tzu
- Shorebird
- Shoveler
- Shrew
- Shrike
- Shrimp
- Siamang
- Siamese cat
- Siberian tiger
- Sidewinder
- Sifaka
- Silkworm
- Silver fox
- Silverfish
- Silverside fish
- Siskin
- Skimmer
- Skink
- Skipper
- Skua
- Skunk
- Skylark
- Sloth
- Sloth bear
- Slug
- Smelts
- Smew
- Snail
- Snake
- Snipe
- Snow dog
- Snow geese
- Snow leopard
- Snow monkey
- Snowy owl
- Sockeye Salmon
- Solenodon
- Solitaire
- Songbird
- Sora
- Southern hair nosed wombat
- Sow
- Spadefoot
- Sparrow
- Sphinx
- Spider
- Spider monkey
- Spiketail
- Sponge
- Spoonbill
- Spotted dolphin
- Spreadwing
- Spring peeper
- Springbok
- Squab
- Squamata
- Squeaker
- Squid
- Squirrel
- Stag
- Stag beetle
- Stallion
- Starfish
- Starling
- Steed
- Steer
- Stegosaurus
- Stick insect
- Stickleback
- Stilt
- Stingray
- Stinkbug
- Stinkpot
- Stoat
- Stork
- Stud
- Sturgeon
- Sugar glider
- Sun bear
- Sun bittern
- Sunfish
- Swallow
- Swallowtail
- Swan
- Swellfish
- Swift
- Swordfish
- T-Rex
- Tadpole
- Tahr
- Takin
- Tamarin
- Tanager
- Tapaculo
- Tapeworm
- Tapir
- Tarantula
- Tarpan
- Tarsier
- Taruca
- Tasmanian devil
- Tasmanian Tiger
- Tattler
- Tayra
- Teal
- Tegus
- Teledu (SE Asian mammal)
- Tench
- Tenrec
- Termite
- Tern
- Terrapin
- Terrier
- Thrasher
- Thrush
- Thunderbird
- Thylacine
- Tick
- Tiger
- Tiger shark
- Tilefish
- Tinamou
- Titi
- Titmouse
- Toad
- Toadfish
- Tomtit
- Topi
- Tortoise
- Toucan
- Towhee
- Tragopan
- Treecreeper
- Triceratops
- Trogon
- Trout
- Trumpeter bird
- Trumpeter swan
- Tsetse fly
- Tuatara
- Tuna
- Turaco
- Turkey
- Turnstone
- Turtle
- Turtle Dove
- Tyrannosaurus Rex
- Uakari
- Uganda kob
- Uinta ground squirrel
- Umbrella bird
- Umbrette
- Unau
- Ungulate
- Unicorn
- Upupa
- Urchin
- Urial
- Uromastyx maliensis
- Uromastyx spinipes
- Urson
- Urubu
- Urus
- Urutu
- Urva
- Utah prairie dog
- Vampire bat
- Vaquita
- Veery
- Velociraptor
- Velvet crab
- Velvet worm
- Venomous snake
- Verdin
- Vervet
- Vicuna
- Viper
- Viper squid
- Viperfish
- Vireo
- Virginia opossum
- Vixen
- Vole
- Volvox
- Vulpes Velox
- Vulpes Vulpes
- Vulture
- Wallaby
- Wallaroo
- Walleye
- Walrus
- Warbler
- Warthog
- Wasp
- Water buffalo
- Water dragons
- Water moccasin
- Waterbuck
- Waterdogs
- Waterthrush
- Wattlebird
- Watussi
- Waxwing
- Weasel
- Weaver bird
- Weevil
- Whale
- Whapuku
- Whelp
- Whimbrel
- Whippet
- Whippoorwill
- White beaked dolphin
- White-eye
- White pelican
- White rhino
- White tailed deer
- White tipped reef shark
- Whooper
- Whooping crane
- Widgeon
- Widow spider
- Wildcat
- Wildebeest
- Willet
- Wireworm
- Wisent
- Wobbegong shark
- Wolf
- Wolf spider
- Wolverine
- Wombat
- Wood storks
- Woodchuck
- Woodcock
- Woodpecker
- Worm
- Wrasse
- Wreckfish
- Wren
- Wrench bird
- Wryneck
- Wuerhosaurus
- Wyvern
- X-Ray fish
- X-Ray tetra
- Xanclomys
- Xanthareel
- Xantus
- Xantus murrelet
- Xeme
- Xenarthra
- Xenoposeidon
- Xenops
- Xenopterygii
- Xenopus
- Xenotarsosaurus
- Xenurine
- Xenurus unicinctus
- Xerus
- Xiaosaurus
- Xinjiangovenator
- Xiphias
- Xiphias gladius
- Xiphosuran
- Xoloitzcuintli
- Xoni
- Xuanhanosaurus
- Xuanhuaceratops
- Xuanhuasaurus
- Yaffle
- Yak
- Yapok
- Yard ant
- Yearling
- Yellow bellied marmot
- Yellow belly lizard
- Yellowhammer
- Yellowjacket
- Yellowlegs
- Yellowthroat
- Yeti
- Ynambu
- Yorkshire terrier
- Yosemite toad
- Yucker
- Zander
- Zanzibar day gecko
- Zebra
- Zebra dove
- Zebra finch
- Zebra-tailed lizard
- Zebrafish
- Zebu
- Zenaida
- Zeren
- Zethus spinipes
- Zethus wasp
- ZigZag salamander
- Zone-tailed pigeon
- Zooplankton
- Zopilote
- Zorilla