1. Archosaur
2. Amniote
3. Arthropod ( Level 3)
4. Bilateria ( Level 4)
5. Chordate ( Level 4)
6. Craniate ( Level 4)
7. Deuterostome
8. Ediacaran biota
9. Gnathostomata ( Level 4)
10. Invertebrate ( Level 4)
11. Protostome
12. Tetrapod ( Level 4)
13. Vertebrate ( Level 4)
14. Worm

This section contains 24 articles.

1. Abyssinian cat
2. American Shorthair
3. Balinese cat
4. Birman
5. Burmese cat
6. Cornish Rex
7. Devon Rex
8. Domestic long-haired cat
9. Domestic short-haired cat ( Level 4)
10. Exotic Shorthair
11. Himalayan cat
12. Maine Coon
13. Manx cat
14. Oriental Shorthair
15. Persian cat
16. Ragdoll
17. Ragamuffin cat
18. Russian Blue
19. Siamese cat ( Level 4)
20. Somali cat
21. Sphynx cat
22. Tabby cat
23. Tonkinese cat
24. Turkish Angora

This section contains 17 articles.

1. Aberdeen Angus
2. American Brahman ( Level 4)
3. Charolais cattle
4. Chianina
5. Corriente
6. Guernsey cattle
7. Hereford cattle ( Level 4)
8. Highland cattle
9. Holstein Friesian ( Level 4)
10. Limousin cattle
11. Jersey cattle
12. Simmental cattle
13. Spanish Fighting Bull
14. Texas Longhorn

Miniature cattle

This section contains 3 articles.

1. Australian Lowline
2. Dexter cattle
3. Vechur cattle

This section contains 5 articles.

1. Australorp
2. Leghorn chicken
3. Plymouth Rock chicken
4. Rhode Island Red
5. Silkie

This section contains 33 articles.

1. Free-ranging dog
   1. African village dog
   2. Pye-dog
   3. Street dog
2. Gun dog ( Level 4)
   1. Pointing dog
   2. Retriever
   3. Setter
   4. Spaniel
   5. Water dog
3. Herding dog ( Level 4)
   1. Collie
4. Hound ( Level 4)
   1. Scent hound
      1. Basset
      2. Coonhound
      3. Foxhound
   2. Sighthound
      1. Greyhound
5. Livestock guardian dog ( Level 4)
6. Mastiff ( Level 4)
   1. Bulldog type
7. Mongrel
   1. Dog crossbreed
8. Spitz ( Level 4)
   1. Husky
   2. Laika (dog type)
9. Terrier ( Level 4)
   1. Bull and terrier
   2. Fell Terrier
   3. Fox Terrier
10. Toy dog
    1. Bichon

This section contains 4 articles.

1. Amiatina
2. Baudet du Poitou
3. Corsican donkey
4. North American donkeys

This section contains 5 articles.

1. Angora goat
2. Alpine goat
3. Cashmere goat
4. Kinder goat
5. Nigerian Dwarf goat

This section contains 11 articles.

1. Arabian horse ( Level 4)
2. Andalusian horse ( Level 4)
3. Appaloosa
4. Clydesdale horse
5. Friesian horse ( Level 4)
6. Lipizzan
7. Miniature horse
8. Palomino
9. Pony ( Level 4)
   1. Shetland pony
10. Thoroughbred ( Level 4)

This section contains 8 articles.

1. Bovid hybrid
2. Canid hybrid
3. Hinny
4. Mule ( Level 4)
5. Panthera hybrid
6. Sheep–goat hybrid
7. Ursid hybrid
8. Zebroid

This section contains 3 articles.

1. Domestic pigeon
   1. Fancy pigeon
   2. Homing pigeon

This section contains 3 articles.

1. Berkshire pig
2. Black Iberian pig
3. Vietnamese Pot-bellied

This section contains 5 articles.

1. Angora rabbit
2. Chinchilla rabbit
3. Dwarf rabbit
4. Flemish Giant rabbit
5. Rex rabbit

This section contains 5 articles.

1. Jacob sheep
2. Leicester Longwool
3. Merino ( Level 4)
4. New Zealand Romney
5. Rambouillet sheep

This section contains 2 articles.

1. Broad Breasted White turkey
2. Norfolk Black

1. Balto
2. Bucephalus
3. Dolly (sheep)
4. Hachikō
5. Jumbo
6. Koko (gorilla)
7. Laika
8. Lonesome George
9. Man o' War
10. Phar Lap
11. Punxsutawney Phil
12. Rin Tin Tin
13. Seabiscuit
14. Secretariat (horse)

This section contains 28 articles.

1. Mammal ( Level 3)
2. Astrapotheria
3. Colugo
4. Hyaenodonta
   1. Hyaenodon
5. Litopterna
   1. Macrauchenia
6. Mesonychia
   1. Mesonychidae
7. Notoungulata
   1. Toxodon
8. Oxyaenidae
9. Pangolin ( Level 4)
10. Pantodonta
    1. Coryphodon
11. Saber-toothed predator
12. Taeniodonta
13. Treeshrew
14. Uintatherium
15. Ungulate

Stem-mammals

This section contains 8 articles.

1. Mammaliaformes
   1. Castorocauda
   2. Megazostrodon
   3. Multituberculata
   4. Eomaia
   5. Euharamiyida
   6. Eutriconodonta
      1. Repenomamus

This section contains 33 articles.

Proboscidea

This section contains 21 articles.

1. Proboscidea ( Level 4)
2. Deinotheriidae
   1. Deinotherium
3. Elephantidae
   1. Elephant ( Level 4)
      1. African bush elephant
      2. African forest elephant
      3. Asian elephant
      4. Dwarf elephant
      5. North African elephant
   2. Mammoth ( Level 4)
      1. Columbian mammoth
      2. Woolly mammoth
4. Gomphothere
   1. Anancus
5. Mammutidae
   1. Mastodon
6. Moeritherium
7. Platybelodon
8. Stegodontidae
   1. Stegodon

Sirenia

This section contains 4 articles.

1. Sirenia ( Level 4)
   1. Dugong
   2. Manatee
   3. Steller's sea cow

Other afrotheres

This section contains 8 articles.

1. Aardvark ( Level 4)
2. Arsinoitherium
3. Desmostylia
4. Elephant shrew
5. Giant otter shrew
6. Golden mole
7. Hyrax ( Level 4)
8. Tenrec

This section contains 10 articles.

1. Bat ( Level 4)
2. Megabat ( Level 4)
   1. Pteropus ( Level 4)
      1. Indian flying fox
3. Microbat ( Level 4)
   1. Bulldog bat
   2. Honduran white bat
   3. Horseshoe bat
   4. Vampire bat ( Level 4)
   5. Vespertilionidae

This section contains 147 articles.

Carnivora: General

This section contains 1 article.

1. Carnivora ( Level 4)

Bears

This section contains 14 articles.

1. Bear ( Level 4)
2. American black bear
3. Arctodus
4. Asian black bear
5. Brown bear ( Level 4)
   1. Eurasian brown bear
   2. Grizzly bear
   3. Kodiak bear
6. Cave bear
7. Giant panda ( Level 4)
8. Polar bear ( Level 4)
9. Sloth bear
10. Spectacled bear
11. Sun bear

Canines

This section contains 33 articles.

1. African wild dog
2. African wolf
3. Bat-eared fox
4. Bush dog
5. Canidae ( Level 4)
6. Caninae
7. Canis
8. Coyote ( Level 4)
9. Coywolf
10. Dhole
11. Dire wolf
12. Dog ( Level 3)
13. Dingo ( Level 4)
14. Ethiopian wolf
15. Falkland Islands wolf
16. Fox ( Level 4)
    1. Crab-eating fox
    2. Gray fox
    3. Vulpes
       1. Arctic fox
       2. Fennec fox
       3. Red fox
17. Jackal ( Level 4)
    1. Black-backed jackal
    2. Golden jackal
    3. Side-striped jackal
18. Maned wolf
19. Raccoon dog
20. Red wolf
21. Short-eared dog
22. South American fox
23. Wolf ( Level 4)
24. Wolfdog

Felines

This section contains 31 articles.

1. Felidae ( Level 4)
2. Cat ( Level 3)
   1. Feral cat
   2. Wildcat
3. Caracal
4. Cheetah ( Level 4)
5. Cougar ( Level 4)
6. Fishing cat
7. Lynx ( Level 4)
   1. Bobcat
8. Ocelot
9. Pallas's cat
10. Rusty-spotted cat
11. Serval

Panthera

This section contains 17 articles.

1. Panthera
2. Clouded leopard
3. Sunda clouded leopard
4. Jaguar ( Level 4)
5. Leopard ( Level 4)
6. Lion ( Level 4)
   1. American lion
   2. Asiatic lion
   3. Barbary lion
7. Panthera spelaea
8. Snow leopard ( Level 4)
9. Tiger ( Level 4)
   1. Bengal tiger
   2. White tiger
   3. Caspian tiger
   4. Siberian tiger
   5. Sumatran tiger

Mustelidae

This section contains 25 articles.

1. Mustelidae ( Level 4)
2. Badger
   1. American badger
   2. European badger ( Level 4)
   3. Honey badger ( Level 4)
3. Ferret-badger
4. Ictonychinae
5. Marten ( Level 4)
   1. Beech marten
   2. Sable
   3. Yellow-throated marten
6. Megalictis
7. Neogale
   1. American mink
   2. Long-tailed weasel
8. Otter ( Level 4)
   1. Giant otter
   2. Sea otter ( Level 4)
   3. Smooth-coated otter
9. Weasel ( Level 4)
   1. European mink
   2. European polecat
      1. Ferret
   3. Stoat ( Level 4)
10. Wolverine ( Level 4)

Pinnipeds

This section contains 9 articles.

1. Pinniped ( Level 4)
2. Eared seal ( Level 4)
   1. Harbor seal
   2. Leopard seal
   3. Elephant seal
3. Earless seal ( Level 4)
   1. Fur seal
   2. Sea lion
4. Walrus ( Level 4)

Procyonidae

This section contains 7 articles.

1. Procyonidae ( Level 4)
2. Bassaricyon
3. Cacomistle
4. Coati
5. Kinkajou
6. Raccoon
7. Ringtail

Other carnivora

This section contains 27 articles.

1. African palm civet
2. Ailuridae
   1. Red panda
3. Amphicyonidae
   1. Amphicyon
4. Asiatic linsang
5. Borophagus
6. Eupleridae
   1. Fossa (animal)
7. Hyena ( Level 4)
   1. Aardwolf
   2. Cave hyena
8. Machairodontinae
   1. Dinofelis
   2. Smilodon ( Level 4)
9. Mephitidae
   1. Skunk ( Level 4)
      1. Spotted skunk
10. Mongoose ( Level 4)
    1. Egyptian mongoose
    2. Meerkat
11. Nimravidae
12. Viverridae
    1. African civet
    2. Banded palm civet
    3. Binturong
    4. Genet (animal)

This section contains 10 articles.

1. Erinaceidae
   1. Hedgehog ( Level 4)
      1. Domesticated hedgehog
   2. Moonrat
2. Desman
3. Mole (animal) ( Level 4)
   1. Eastern mole
   2. Star-nosed mole
4. Shrew ( Level 4)
5. Solenodon

This section contains 150 articles.

1. Artiodactyl ( Level 4)
2. Ruminant ( Level 4)

Bovidae

This section contains 43 articles.

1. Bovidae ( Level 4)
2. African buffalo ( Level 4)
3. Antelope ( Level 4)
   1. Addax
   2. Blackbuck
   3. Dik-dik
   4. Duiker
   5. Gazelle ( Level 4)
   6. Gerenuk
   7. Greater kudu
   8. Impala ( Level 4)
   9. Oryx
      1. Arabian oryx
   10. Saiga antelope
   11. Springbok
   12. Wildebeest ( Level 4)
4. Aurochs ( Level 4)
5. Banteng
6. Capra (genus) ( Level 4)
   1. Alpine ibex
   2. Goat ( Level 4)
   3. Markhor
   4. Mountain goat
   5. Wild goat
7. Cattle ( Level 3)
   1. Zebu
8. Chamois
9. Gaur ( Level 4)
10. Muskox ( Level 4)
11. Serow
12. Sheep ( Level 3)
    1. Barbary sheep
    2. Bighorn sheep
    3. Dall sheep
13. Tahr
14. Takin
15. Water buffalo ( Level 4)
    1. Wild water buffalo
16. Yak ( Level 4)
    1. Wild yak

Bison

This section contains 3 articles.

1. Steppe bison
2. American bison ( Level 4)
3. European bison ( Level 4)

Camelidae

This section contains 10 articles.

1. Aepycamelus
2. Alpaca ( Level 4)
3. Guanaco ( Level 4)
4. Llama ( Level 4)
5. Vicuña ( Level 4)
6. Camel ( Level 4)
   1. Bactrian camel ( Level 4)
      1. Wild Bactrian camel
   2. Dromedary ( Level 4)
      1. Australian feral camel

Cetaceans

This section contains 42 articles.

1. Cetacea ( Level 4)
2. Whale ( Level 4)
3. Evolution of cetaceans
   1. Ambulocetus
   2. Basilosaurus
   3. Dorudon
   4. Livyatan
   5. Odobenocetops
   6. Remingtonocetidae

Baleen whales

This section contains 9 articles.

1. Baleen whale
2. Blue whale ( Level 4)
3. Bowhead whale
4. Fin whale
5. Gray whale
6. Humpback whale ( Level 4)
7. Minke whale
8. Right whale
   1. Southern right whale

Toothed whale

This section contains 24 articles.

1. Toothed whale
2. Beaked whale
   1. Mesoplodon
3. Beluga whale
4. Dolphin ( Level 4)
   1. Oceanic dolphin
   2. Bottlenose dolphin
      1. False killer whale
      2. Orca ( Level 4)
      3. Pilot whale
      4. Hector's dolphin
      5. Right whale dolphin
      6. Risso's dolphin
   3. River dolphin
      1. Baiji
      2. Amazon river dolphin
5. Narwhal
6. Porpoise ( Level 4)
   1. Dall's porpoise
   2. Finless porpoise
   3. Harbour porpoise
   4. Vaquita
7. Sperm whale ( Level 4)
   1. Pygmy sperm whale

Deer

This section contains 16 articles.

1. Deer ( Level 4)
   1. Red deer ( Level 4)
   2. Sika deer
2. Cervalces
3. Chital
4. Elk ( Level 4)
5. European fallow deer
6. Irish elk
7. Moose ( Level 4)
8. Muntjac
9. Père David's deer
10. Pudu
11. Reindeer ( Level 4)
12. Roe deer
13. Water deer
14. White-tailed deer

Giraffidae

This section contains 9 articles.

1. Giraffidae
2. Giraffe ( Level 4)
   1. Masai giraffe
   2. Northern giraffe
   3. Reticulated giraffe
   4. Southern giraffe
3. Okapi
4. Prolibytherium
5. Sivatherium

Pigs

This section contains 9 articles.

1. Suidae
   1. Sus (genus) ( Level 4)
      1. Bornean bearded pig
      2. Pig ( Level 3)
      3. Wild boar ( Level 4)
   2. Babirusa
   3. Warthog
   4. Red river hog
2. Peccary ( Level 4)

Other artiodactyla

This section contains 19 articles.

1. Andrewsarchus
2. Anoplotheriidae
   1. Anoplotherium
3. Antilocapridae
   1. Pronghorn ( Level 4)
4. Anthracotheriidae
   1. Anthracotherium
5. Cainotheriidae
6. Chevrotain
   1. Dorcatherium
7. Entelodontidae
   1. Daeodon
8. Hippopotamus ( Level 4)
   1. Pygmy hippopotamus
9. Merycoidodontoidea
10. Moschidae
    1. Musk deer
11. Palaeomerycidae
12. Protoceratidae

This section contains 9 articles.

1. Lagomorpha ( Level 4)
2. Hare ( Level 4)
   1. Antelope jackrabbit
   2. European hare
   3. Snowshoe hare
3. Pika
4. Rabbit ( Level 4)
   1. Cottontail rabbit
   2. European rabbit

This section contains 40 articles.

1. Marsupial ( Level 4)
   1. Didelphodon
   2. Marsupial mole
2. Sparassodonta
   1. Thylacosmilus
3. Phalangeriformes
   1. Common brushtail possum
   2. Common ringtail possum
   3. Honey possum
   4. Sugar glider
4. Dasyuromorphia ( Level 4)
   1. Numbat
   2. Quoll
   3. Dunnart
   4. Tasmanian devil ( Level 4)
   5. Thylacine
5. Opossum ( Level 4)
   1. Virginia opossum
6. Peramelemorphia ( Level 4)
   1. Bandicoot
   2. Macrotis

Diprotodontia

This section contains 19 articles.

1. Diprotodontia ( Level 4)
2. Macropodiformes
   1. Sthenurus
   2. Kangaroo ( Level 4)
      1. Red kangaroo
      2. Eastern grey kangaroo
      3. Western grey kangaroo
   3. Wallaby
      1. Rock-wallaby
   4. Wallaroo
   5. Tree-kangaroo
   6. Potoroo
   7. Quokka
   8. Pademelon
3. Vombatiformes
   1. Koala ( Level 4)
   2. Wombat
   3. Thylacoleo
   4. Diprotodon

This section contains 3 articles.

1. Monotreme ( Level 4)
2. Echidna ( Level 4)
3. Platypus ( Level 4)

This section contains 39 articles.

1. Perissodactyla ( Level 4)
2. Brontotheriidae
   1. Megacerops
3. Chalicotheriidae
   1. Chalicotherium
4. Lophiodon
5. Palaeotheriidae
   1. Palaeotherium
6. Rhinocerotoidea
   1. Paraceratherium
   2. Rhinoceros ( Level 4)
      1. Elasmotherium
      2. Black rhinoceros
      3. Indian rhinoceros
      4. Javan rhinoceros
      5. Sumatran rhinoceros
      6. White rhinoceros
      7. Teleoceras
      8. Woolly rhinoceros
7. Tapir ( Level 4)
   1. Malayan tapir

Equidae

This section contains 18 articles.

1. Equidae ( Level 4)
2. Evolution of the horse
   1. Eohippus
3. Donkey ( Level 4)
   1. African wild ass
   2. Kiang
   3. Onager
4. Hipparionini
   1. Hipparion
5. Horse ( Level 3)
   1. Feral horse
   2. Przewalski's horse
   3. Tarpan
6. Zebra ( Level 4)
   1. Grévy's zebra
   2. Mountain zebra
   3. Plains zebra
      1. Quagga

This section contains 62 articles.

1. Primate ( Level 3)
2. Monkey ( Level 4)

Apes

This section contains 21 articles.

1. Ape ( Level 4)
   1. Dryopithecus
   2. Gigantopithecus
   3. Proconsul (mammal)
2. Gibbon ( Level 4)
   1. Lar gibbon
   2. Siamang
3. Gorilla ( Level 4)
   1. Cross River gorilla
   2. Eastern lowland gorilla
   3. Mountain gorilla
   4. Western lowland gorilla
4. Orangutan ( Level 4)
   1. Bornean orangutan
   2. Sumatran orangutan
   3. Tapanuli orangutan
5. Pan (genus) ( Level 4)
   1. Chimpanzee ( Level 4)
   2. Bonobo ( Level 4)
6. Sivapithecus
7. Human ( Level 1)

New World monkeys

This section contains 11 articles.

1. New World monkey ( Level 4)
   1. Capuchin monkey ( Level 4)
   2. Howler monkey
   3. Lion tamarin
   4. Marmoset
      1. Pygmy marmoset
   5. Night monkey
   6. Spider monkey ( Level 4)
   7. Squirrel monkey
   8. Tamarin
   9. Uakari

Old World monkeys

This section contains 16 articles.

1. Old World monkey ( Level 4)
2. Cercopithecinae
   1. Baboon ( Level 4)
      1. Hamadryas baboon
   2. Chlorocebus
   3. Gelada
   4. Macaque ( Level 4)
      1. Crab-eating macaque
      2. Japanese macaque
      3. Mangabey
      4. Rhesus macaque ( Level 4)
   5. Mandrill
3. Colobinae
   1. Black-and-white colobus
   2. Semnopithecus
   3. Proboscis monkey

Strepsirrhini

This section contains 10 articles.

1. Strepsirrhini ( Level 4)
   1. Galago ( Level 4)
   2. Lemur ( Level 4)
      1. Aye-aye
      2. Indri
      3. Ring-tailed lemur
      4. Ruffed lemur
      5. Sifaka
      6. Subfossil lemur
   3. Slow loris ( Level 4)

Other primates

This section contains 2 articles.

1. Purgatorius
2. Tarsier ( Level 4)

This section contains 52 articles.

1. Rodent ( Level 3)
2. Agouti
3. Blesmol
4. Capybara ( Level 4)
5. Nutria ( Level 4)
6. Beaver ( Level 4)
7. Chinchilla
8. Jerboa
9. Dormouse ( Level 4)
10. Giant pouched rat
11. Gopher
12. Groundhog
13. Guinea pig ( Level 4)
14. Hamster ( Level 4)
15. Horned gopher
16. Kangaroo rat
17. Lemming
18. Muridae ( Level 4)
    1. Gerbillinae
    2. Rat ( Level 4)
       1. Black rat
       2. Brown rat ( Level 4)
       3. Laboratory rat
       4. Polynesian rat
    3. Mouse ( Level 4)
       1. House mouse
       2. Laboratory mouse
19. Muskrat ( Level 4)
20. Naked mole-rat
21. Octodon
22. Pedetes
23. Porcupine ( Level 4)
    1. Old World porcupine
    2. Prehensile-tailed porcupine
24. Spalax
25. Spermophilus
26. Squirrel ( Level 4)
    1. Callosciurus
    2. Chipmunk
    3. Flying squirrel
    4. Ground squirrel
       1. Marmot ( Level 4)
       2. Prairie dog
    5. Oriental giant squirrel
    6. Pine squirrel
    7. Sciurus
       1. Eastern gray squirrel
       2. Red squirrel
    8. Tree squirrel
    9. Xerini
27. Viscacha
28. Vole

This section contains 10 articles.

1. Anteater ( Level 4)
   1. Giant anteater
2. Armadillo ( Level 4)
   1. Giant armadillo
   2. Glyptodon
3. Sloth ( Level 4)
   1. Ground sloth
      1. Megatherium
      2. Megalonyx
   2. Two-toed sloth

This section contains 12 articles.

1. Bird ( Level 3)
2. Bird of prey ( Level 4)
3. Fowl
4. Palaeognathae ( Level 4)
5. Seabird ( Level 4)
6. Cuckoo-roller
7. Grebe
8. Flamingo ( Level 4)
9. Loon ( Level 4)
10. Mousebird
11. Seriema
12. Tropicbird

This section contains 27 articles.

1. Accipiter ( Level 4)
2. Bearded vulture
3. Buteo
4. Crested caracara
5. Eagle ( Level 4)
   1. Sea eagle
      1. Bald eagle
   2. Bateleur
   3. Golden eagle ( Level 4)
   4. Haast's eagle
   5. Harpy eagle
   6. Philippine eagle
   7. Steppe eagle
   8. Wedge-tailed eagle
6. Elaninae
7. European honey buzzard
8. Falcon ( Level 4)
   1. Gyrfalcon
   2. Peregrine falcon ( Level 4)
9. New World vulture ( Level 4)
   1. Andean condor
   2. California condor
10. Old World vulture ( Level 4)
    1. Cinereous vulture
    2. Egyptian vulture
11. Osprey ( Level 4)
12. Secretarybird ( Level 4)

This section contains 27 articles.

1. Anatidae
2. Duck ( Level 4)
   1. Diving duck
   2. Mallard ( Level 4)
   3. Mergini
      1. Eider
      2. Long-tailed duck
      3. Mergus
   4. Northern pintail
   5. Northern shoveler
3. Goose ( Level 4)
   1. Anser (bird)
      1. Domestic goose
      2. Greylag goose
      3. Swan goose
      4. Snow goose
   2. Branta
      1. Canada goose
      2. Nene (bird)
4. Magpie goose
5. Moa-nalo
6. Muscovy duck
7. Screamer
8. Tadorna
9. Swan ( Level 4)
   1. Black swan
10. Whistling duck

This section contains 8 articles.

1. Hummingbird ( Level 4)
   1. Giant hummingbird
   2. Rufous hummingbird
   3. White-necked jacobin
2. Swift (bird) ( Level 4)
   1. Common swift
   2. Swiftlet
3. Treeswift

This section contains 5 articles.

1. Nightjar ( Level 4)
2. Frogmouth
3. Oilbird
4. Owlet-nightjar
5. Potoo

This section contains 33 articles.

1. Charadriiformes
2. Auk ( Level 4)
   1. Great auk
   2. Guillemot
   3. Puffin
3. Buttonquail
4. Courser
5. Greater painted-snipe
6. Jacanidae
7. Laridae
   1. Gull ( Level 4)
      1. Larus
      2. Black-headed gull
   2. Rynchops
   3. Tern ( Level 4)
      1. Arctic tern
8. Lapwing
9. Oystercatcher
10. Plover
11. Pratincole
12. Sandpiper ( Level 4)
    1. Curlew
    2. Dowitcher
    3. Godwit
    4. Phalarope
    5. Ruff (bird)
    6. Snipe
    7. Tringa
    8. Turnstone
13. Skua
14. Stilt
    1. Avocet
15. Stone-curlew

This section contains 13 articles.

1. Heron ( Level 4)
   1. Bittern
   2. Cattle egret
   3. Little egret
   4. Night heron
2. Ibis ( Level 4)
   1. African sacred ibis
3. Shoebill ( Level 4)
4. Spoonbill
5. Stork ( Level 4)
   1. Black stork
   2. Marabou stork
   3. White stork

This section contains 19 articles.

1. Columbidae ( Level 4)
   1. Barbary dove
   2. Common wood pigeon
   3. Crowned pigeon
   4. Dodo ( Level 4)
   5. Eared dove
   6. Eurasian collared dove
   7. Feral pigeon
   8. Fruit dove
   9. Gallicolumba
   10. Laughing dove
   11. Mourning dove
   12. Nicobar pigeon
   13. Passenger pigeon ( Level 4)
   14. Rock dove ( Level 4)
   15. Spotted dove
   16. Zebra dove
2. Mesite
3. Sandgrouse

This section contains 13 articles.

1. Bee-eater
2. Kingfisher
   1. River kingfisher ( Level 4)
   2. Tree kingfisher
      1. Kookaburra
   3. Water kingfisher
3. Ground roller
4. Hornbill ( Level 4)
   1. Oriental pied hornbill
   2. Ground hornbill
5. Hoopoe ( Level 4)
6. Motmot
7. Tody

This section contains 10 articles.

1. Cuckoo ( Level 4)
   1. Ani (bird)
   2. Common cuckoo
   3. Coua
   4. Coucal
   5. Clamator
   6. Koel
   7. Roadrunner
2. Hoatzin ( Level 4)
3. Turaco ( Level 4)

This section contains 31 articles.

1. Galliformes ( Level 4)
2. Chachalaca
3. Curassow
4. Francolin
5. Grey junglefowl
6. Grouse ( Level 4)
7. Guan (bird)
8. Guineafowl ( Level 4)
9. Monal
10. Megapode
11. Partridge
12. Peafowl ( Level 4)
13. Phasianidae
14. Red junglefowl
    1. Chicken ( Level 3)
15. Tragopan
16. Turkey (bird)
    1. Domestic turkey ( Level 4)
    2. Ocellated turkey
    3. Wild turkey

Pheasants

This section contains 6 articles.

1. Pheasant
2. Blue eared pheasant
3. Common pheasant ( Level 4)
4. Golden pheasant
5. Green pheasant
6. Lady Amherst's pheasant

Quails

This section contains 5 articles.

1. Domesticated quail
2. New World quail
3. Old World quail
   1. Common quail ( Level 4)
   2. King quail

This section contains 17 articles.

1. Gruiformes ( Level 4)
2. Crane (bird) ( Level 4)
   1. Antigone (bird)
   2. Grey crowned crane
   3. Demoiselle crane
   4. Siberian crane
3. Bustard ( Level 4)
   1. Lesser florican
4. Kagu
5. Limpkin
6. Psophia
7. Rail (bird) ( Level 4)
   1. Coot
   2. Moorhen
   3. Swamphen
      1. Takahē
8. Sunbittern

This section contains 84 articles.

Passerines: General

This section contains 2 articles.

1. Passerine ( Level 4)
2. Songbird ( Level 4)

Corvoidea

This section contains 16 articles.

1. Bird-of-paradise ( Level 4)
2. Bowerbird
3. Corvidae ( Level 4)
   1. Chough
   2. Corvus ( Level 4)
      1. American crow
      2. Common raven ( Level 4)
      3. Hooded crow
      4. House crow
      5. Rook (bird)
   3. Eurasian magpie ( Level 4)
   4. Jay
   5. Western jackdaw
4. Honeyeater ( Level 4)
5. Lyrebird ( Level 4)
6. Shrike ( Level 4)

Passerida

This section contains 60 articles.

1. Accentor
2. Atlantic canary
   1. Domestic canary
3. Australian magpie
4. Bulbul ( Level 4)
5. Bunting (bird) ( Level 4)
6. Cardinalidae ( Level 4)
7. Crossbill
8. Dipper
9. Drongo
10. Estrildidae
    1. Java sparrow
    2. Gouldian finch
11. Finch ( Level 4)
12. Gnatcatcher
13. Hawaiian honeycreeper
14. Icterid ( Level 4)
15. Kinglet
16. Lark ( Level 4)
17. Locustellidae
18. Manakin
19. Mockingbird ( Level 4)
    1. Northern mockingbird
20. Motacillidae
    1. Longclaw
    2. Pipit
    3. Wagtail
21. New World warbler ( Level 4)
22. Nuthatch
23. Old World flycatcher ( Level 4)
    1. Chat (bird)
    2. European robin ( Level 4)
    3. Common nightingale ( Level 4)
24. Old World oriole
25. Old World sparrow ( Level 4)
    1. House sparrow ( Level 4)
26. Oxpecker
27. Penduline tit
28. Old World warbler
29. Ploceidae ( Level 4)
    1. Red-billed quelea
30. Starling ( Level 4)
    1. Myna
       1. Common hill myna
       2. Common myna ( Level 4)
    2. Common starling ( Level 4)
31. Sunbird ( Level 4)
32. Swallow ( Level 4)
    1. Barn swallow
    2. Delichon
33. Tanager
    1. Darwin's finches
34. Tit (bird) ( Level 4)
35. Thrush (bird) ( Level 4)
    1. American robin ( Level 4)
36. Vireo
37. Wallcreeper
38. Waxwing
39. White-eye
40. Wren ( Level 4)

Tyranni

This section contains 6 articles.

1. Tyranni
2. Antbird ( Level 4)
3. Cotinga
   1. Cock-of-the-rock
4. Ovenbird (family) ( Level 4)
5. Tyrant flycatcher ( Level 4)

This section contains 9 articles.

1. Cormorant ( Level 4)
   1. European shag
2. Darter ( Level 4)
3. Frigatebird ( Level 4)
4. Hamerkop
5. Pelican ( Level 4)
6. Sulidae ( Level 4)
   1. Booby
   2. Gannet

This section contains 9 articles.

1. Piciformes
2. Lybiidae
3. Megalaimidae
4. Coraciidae
5. Honeyguide ( Level 4)
6. Jacamar
7. New World barbet
8. Toucan ( Level 4)
9. Woodpecker ( Level 4)

This section contains 6 articles.

1. Procellariiformes ( Level 4)
2. Albatross ( Level 4)
3. Austral storm petrel
4. Northern storm petrel
5. Procellariidae
   1. Giant petrel

This section contains 17 articles.

1. Cockatoo ( Level 4)
   1. Cockatiel
   2. Gang-gang cockatoo
2. New Zealand parrot
   1. Kākāpō
3. True parrot
   1. Parrot ( Level 4)
   2. Amazon parrot
   3. Budgerigar ( Level 4)
   4. Grey parrot
   5. Loriini
   6. Lovebird
   7. Macaw
      1. Ara (bird) ( Level 4)
   8. Parakeet
   9. Rainbow lorikeet
   10. Rosella

This section contains 8 articles.

1. Cassowary ( Level 4)
2. Elephant bird
3. Emu ( Level 4)
4. Kiwi (bird) ( Level 4)
5. Moa ( Level 4)
6. Common ostrich ( Level 4)
7. Rhea (bird) ( Level 4)
8. Tinamou ( Level 4)

This section contains 5 articles.

1. Penguin ( Level 4)
   1. African penguin
   2. Emperor penguin
   3. Little penguin
   4. Crested penguin

This section contains 8 articles.

1. Owl ( Level 4)
2. True owl
   1. Eurasian eagle-owl ( Level 4)
   2. Little owl
   3. Scops owl
   4. Snowy owl
   5. Strix (bird)
3. Barn owl ( Level 4)

This section contains 2 articles.

1. Trogon ( Level 4)
2. Resplendent quetzal ( Level 4)

This section contains 20 articles.

1. Archaeopteryx ( Level 4)
2. Asteriornis
3. Balaur bondoc
4. Confuciusornis
5. Dromornis
6. Enantiornithes
7. Gastornis
8. Hesperornis
9. Ichthyornis
10. Inkayacu
11. Pelagornithidae
    1. Pelagornis
12. Phorusrhacidae
    1. Kelenken
    2. Phorusrhacos
    3. Titanis
13. Plotopteridae
14. Presbyornis
15. Teratornithidae
    1. Argentavis

This section contains 7 articles.

1. Reptile ( Level 3)
2. Sauropsida
3. Sauria
4. Archosauromorpha
5. Squamata
   1. Amphisbaenia
   2. Dibamidae

This section contains 15 articles.

1. Crocodilia ( Level 4)
2. Alligator ( Level 4)
   1. American alligator
   2. Chinese alligator
3. Caiman ( Level 4)
   1. Black caiman
   2. Cuvier's dwarf caiman
4. Crocodile ( Level 4)
   1. Dwarf crocodile
   2. Freshwater crocodile
   3. Mugger crocodile
   4. Nile crocodile
   5. Saltwater crocodile
5. Gharial
6. False gharial

This section contains 42 articles.

1. Lizard ( Level 4)
2. Cordylidae
3. Gecko ( Level 4)
   1. Common house gecko
   2. Eublepharis
   3. Mediterranean house gecko
   4. Tokay gecko
   5. Uroplatinae
4. Gila monster ( Level 4)
5. Lacertidae
   1. Lacerta (genus)
   2. Viviparous lizard
6. Legless lizard
   1. Anguinae
7. Monitor lizard
   1. Asian water monitor
   2. Bengal monitor
   3. Komodo dragon ( Level 4)
   4. Nile monitor
   5. Perentie
8. Skink ( Level 4)
   1. Blue-tongued skink
9. Teiidae
   1. New Mexico whiptail

Iguania

This section contains 18 articles.

1. Agamidae
   1. Chinese water dragon
   2. Frilled lizard
   3. Draco (lizard)
   4. Hydrosaurus
   5. Oriental garden lizard
   6. Pogona
   7. Thorny devil
   8. Uromastyx
2. Chameleon ( Level 4)
   1. Jackson's chameleon
3. Basiliscus (lizard)
4. Common collared lizard
5. Dactyloidae
6. Iguanidae
   1. Green iguana ( Level 4)
   2. Marine iguana
7. Horned lizard ( Level 4)

This section contains 3 articles.

1. Rhynchocephalia
   1. Pleurosauridae
   2. Tuatara ( Level 4)

This section contains 40 articles.

1. Snake ( Level 4)
2. Boidae ( Level 4)
   1. Anaconda
   2. Boa constrictor
3. Colubridae
   1. Ahaetulla
   2. Bungarus
   3. Chrysopelea
   4. Corn snake
   5. Garter snake ( Level 4)
   6. Grass snake
   7. Kingsnake
4. Elapidae
   1. Cobra
      1. King cobra
      2. Naja
   2. Common death adder
   3. Coral snake ( Level 4)
   4. Mamba ( Level 4)
      1. Black mamba
      2. Jameson's mamba
   5. Red-bellied black snake
   6. Sea snake ( Level 4)
      1. Sea krait
         1. Yellow-lipped sea krait
      2. Yellow-bellied sea snake
   7. Taipan
      1. Inland taipan
5. Pythonidae
   1. Python (genus)
      1. Ball python
      2. Reticulated python
6. Scolecophidia
7. Viperidae
   1. Pit viper
      1. Agkistrodon piscivorus ( Level 4)
      2. Eastern copperhead ( Level 4)
   2. Rattlesnake ( Level 4)
   3. Adder ( Level 4)
8. Xenopeltis

This section contains 20 articles.

1. Turtle ( Level 4)
2. Alligator snapping turtle ( Level 4)
3. Box turtle ( Level 4)
4. Chelodina
5. Common snapping turtle ( Level 4)
6. Diamondback terrapin
7. Painted turtle ( Level 4)
8. Red-eared slider ( Level 4)
9. Sea turtle ( Level 4)
   1. Green sea turtle
   2. Leatherback sea turtle
   3. Loggerhead sea turtle
   4. Hawksbill sea turtle
10. Tortoise ( Level 4)
    1. Aldabra giant tortoise
    2. Galápagos tortoise ( Level 4)
    3. African spurred tortoise
    4. Testudo (genus)
11. Trionychidae
12. Wood turtle

This section contains 126 articles.

Dinosaurs

This section contains 88 articles.

1. Dinosaur ( Level 3)
2. Feathered dinosaur
3. Eoraptor
4. Herrerasaurus
5. Saurischia

Ornitischians

This section contains 33 articles.

1. Ornithischia
2. Heterodontosauridae
   1. Heterodontosaurus
3. Marginocephalia
   1. Pachycephalosauria
      1. Pachycephalosaurus
      2. Stegoceras
   2. Ceratopsia
      1. Pachyrhinosaurus
      2. Protoceratops
      3. Psittacosaurus
      4. Styracosaurus
      5. Triceratops ( Level 4)
      6. Yinlong
4. Ornithopoda
   1. Hypsilophodon
   2. Iguanodon ( Level 4)
   3. Leaellynasaura
   4. Hadrosauridae
      1. Corythosaurus
      2. Edmontosaurus
      3. Lambeosaurus
      4. Parasaurolophus
5. Thyreophora
   1. Ankylosauria
      1. Ankylosaurus
      2. Euoplocephalus
      3. Nodosauridae
   2. Scelidosaurus
   3. Stegosauria
      1. Kentrosaurus
      2. Stegosaurus ( Level 4)
6. Thescelosaurus

Sauropods

This section contains 13 articles.

1. Plateosaurus
2. Sauropoda
   1. Amargasaurus
   2. Apatosaurus ( Level 4)
   3. Brachiosaurus
   4. Brontosaurus
   5. Camarasaurus
   6. Diplodocus ( Level 4)
   7. Europasaurus
   8. Mamenchisauridae
   9. Titanosauria
      1. Argentinosaurus
      2. Saltasauridae

Theropods

This section contains 37 articles.

1. Theropoda
2. Carnosauria
   1. Abelisauridae
      1. Carnotaurus
   2. Allosaurus ( Level 4)
   3. Ceratosaurus
   4. Dilophosaurus
   5. Giganotosaurus
   6. Masiakasaurus
   7. Megalosaurus
   8. Spinosauridae
      1. Baryonyx
      2. Spinosaurus
3. Coelophysis
4. Coelurosauria
   1. Alvarezsauridae
   2. Anchiornis
   3. Caenagnathidae
   4. Compsognathus
   5. Dromaeosauridae
      1. Deinonychus
      2. Halszkaraptor
      3. Incisivosaurus
      4. Microraptor
      5. Unenlagiinae
      6. Utahraptor
      7. Velociraptor ( Level 4)
   6. Ornithomimosauria
      1. Deinocheirus
      2. Ornithomimus
   7. Oviraptor
   8. Scansoriopterygidae
   9. Therizinosaurus
   10. Troodontidae
   11. Tyrannosauroidea
       1. Tyrannosaurus ( Level 4)
       2. Yutyrannus

Pterosaurs

This section contains 15 articles.

1. Pterosaur ( Level 4)
2. Anurognathidae
3. Azhdarchidae
   1. Hatzegopteryx
   2. Quetzalcoatlus
4. Dimorphodon
5. Dsungaripterus
6. Peteinosaurus
7. Pteranodon
8. Pterodactylus
9. Pterodaustro
10. Rhamphorhynchus
11. Ornithocheirus
12. Tapejaridae
    1. Thalassodromeus

Other prehistoric archosaurs

This section contains 23 articles.

1. Aetosaur
2. Euparkeria
3. Lagerpetidae
4. Metriorhynchidae
5. Phytosaur
6. Poposauroidea
   1. Arizonasaurus
   2. Effigia
7. Postosuchus
8. Proterosuchus
9. Scleromochlus
10. Silesauridae
11. Teleosauridae

Prehistoric crocodiles

This section contains 10 articles.

1. Boverisuchus
2. Deinosuchus
3. Notosuchia
   1. Baurusuchidae
   2. Kaprosuchus
   3. Simosuchus
4. Mekosuchus
5. Sarcosuchus
6. Stomatosuchidae
7. Voay

This section contains 44 articles.

1. Drepanosaur
2. Youngina
3. Hylonomus
4. Longisquama
5. Rhynchosaur
6. Sharovipteryx
7. Shringasaurus
8. Thalattosauria
9. Tanystropheus

Parareptilia

This section contains 3 articles.

1. Parareptilia
   1. Pareiasauria
      1. Scutosaurus

Prehistoric squamates

This section contains 8 articles.

1. Madtsoiidae
2. Megalania
3. Mosasaur
   1. Dallasaurus
   2. Mosasaurus
   3. Tylosaurus
4. Najash
5. Titanoboa

Choristoderes

This section contains 2 articles.

1. Choristodera
   1. Champsosaurus

Prehistoric turtles

This section contains 4 articles.

1. Archelon
2. Meiolania
3. Proganochelys
4. Stupendemys

Prehistoric marine reptiles

This section contains 18 articles.

1. Ichthyosauria
   1. Ichthyosaurus
   2. Ophthalmosaurus
   3. Platypterygius
   4. Shonisaurus
   5. Temnodontosaurus
2. Mesosaurus
3. Nothosaurus
4. Placodontia
5. Plesiosaur ( Level 4)
   1. Plesiosauroidea
      1. Cryptoclidus
      2. Elasmosaurus
      3. Polycotylidae
      4. Plesiosaurus
   2. Pliosauroidea
      1. Kronosaurus
      2. Liopleurodon