All these animals have endoskeletons and are the most recognized group of animals.
All items (4433)
A
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- Aracá Uakari
- Arambourgiania
- Arandaspis
- Arapaima Gigas
- Archaeoceti
- Archaeopteryx
- Archbold's Bowerbird
- Archbold's Newtonia
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- Archbold's Owlet-nightjar
- Arctic Fox
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- Arctic Wolf
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- Arfak Rainbowfish
- Argali
- Ariégeois
- Armbruster's Wolf
- Armed Cranch Squid
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- Armenian Tortoise
- Arnhold’s Mouse Lemur
- Arnoux's Beaked Whale
- Arrabal's Suriname Toad
- Arrowhead Piculet
- Arthur's Stubfoot Toad
- Artiodactyla
- Arunachal Macaque
- Ash Meadows Killifish
- Ash-throated Gnateater
- Ashy Black Titi
- Ashy Chinchilla Rat
- Ashy Minivet
- Ashy Tailorbird
- Ashy-bellied White-eye
- Ashy-faced Owl
- Ashy-headed Green Pigeon
- Ashy-tailed Swift
- Asháninka Arboreal Chinchilla Rat
- Asian Badger
- Asian Garden Dormouse
- Asian Palm Civet
- Asian Palm Swift
- Asian Sheepshead Wrasse
- Asian Stubtail
- Asiatic Brush-tailed Porcupine
- Aspidontus tractus
- Assumption Island Day Gecko
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- Asterophrys turpicola
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- Astraspis
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- Atelopus arsyecue
- Atelopus chrysocorallus
- Atelopus epikeisthos
- Atelopus eusebiodiazi
- Atelopus exiguus
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- Atelopus laetissimus
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- Atelopus lynchi
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- Atelopus minutulus
- Atelopus mittermeieri
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- Atelopus mucubajiensis
- Atelopus muisca
- Atelopus nahumae
- Atelopus Nanay
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- Atelopus onorei
- Atelopus oxyrhynchus
- Atelopus pachydermus
- Atelopus palmatus
- Atelopus patazensis
- Atelopus pedimarmoratus
- Atelopus petersi
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- Atelopus planispina
- Atelopus pulcher
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- Atelopus reticulatus
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- Atelopus senex
- Atelopus sernai
- Atelopus simulatus
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- Atelopus sonsonensis
- Atelopus spurrelli
- Atelopus subornatus
- Atlantic Blue Marlin
- Atlantic Coast Leopard Frog
- Atlantic Goliath Grouper
- Atlantic Mudskipper
- Atlantic Titi
- Atlantic Trumpetfish
- Atoll Fruit Dove
- Atretochoana
- Auckland Rail
- Aulotrachichthys
- Austen's Brown Hornbill
- Austral Negrito
- Australasian Figbird
- Australian Blackspotted Catshark
- Australian Brushturkey
- Australian Bustard
- Australian Ghostshark
- Australian Lace-lid
- Australian Owlet-nightjar
- Australian Pelican
- Australian Pratincole
- Australian Snubfin Dolphin
- Australian Swiftlet
- Australotitan
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- Axolotl
- Aye-aye
- Ayres's Hawk-eagle
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- Azuay Stubfoot Toad
- Azure Kingfisher
- Azure-crested Flycatcher
- Azure-naped Jay
B
- Babbling Starling
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- Bahaman Barn Owl
- Baiji
- Baikal Teal
- Baiomys
- Baja California Pronghorn
- Balaenidae
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- Bald Parrot
- Bald Uakari
- Balearic Shrew
- Bali Tiger
- Balmain Bug
- Banahao Shrew Rat
- Banana Bat
- Band-rumped Swift
- Band-tailed Nighthawk
- Band-tailed Seedeater
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- Banded Barbet
- Banded Broadbill
- Banded Cotinga
- Banded Fruit Dove
- Banded Linsang
- Banded Quail
- Banded Supple Skink
- Banded Whiptail
- Banff Longnose Dace
- Banggai Fruit Dove
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- Baptista Lake Titi
- Bar-backed Partridge
- Bar-bellied Cuckooshrike
- Bar-breasted Piculet
- Bar-winged Flycatcher-shrike
- Bar-winged Rail
- Barb
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- Barbary Striped Grass Mouse
- Barbourofelidae
- Bare-bellied Hedgehog
- Bare-eyed Myna
- Bare-eyed Rail
- Bare-eyed White-eye
- Bare-faced Ground Dove
- Bare-legged Owl
- Bare-legged Swiftlet
- Bare-naped Goby
- Bare-necked Fruitcrow
- Bare-necked Umbrellabird
- Bare-throated Bellbird
- Barking Imperial Pigeon
- Barking Owl
- Barn Swallow
- Barred Antthrush
- Barred Cuckooshrike
- Barred Honey Buzzard
- Barred Long-tailed Cuckoo
- Barred Owlet-nightjar
- Barred Puffbird
- Barrington Land Iguana
- Bartle Frere Skink
- Basilosauridae
- Bat
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- Bate's Slit-faced Bat
- Bateleur
- Bates' Tree Toad
- Bates's Nightjar