- Abert's Towhee
- Abyssinian White-eye
- Acorn Woodpecker
- Adelie Penguin
- African Black Duck
- African Black Swift
- African Finfoot
- African Paradise Flycatcher
- African Pied Hornbill
- African Pipit
- African Sacred Ibis
- African Silverbill
- African Yellow Warbler
- Alder Flycatcher
- Aleutian Tern
- Allen's Hummingbird
- Altamira Oriole
- Amazilia Hummingbird
- Amazon Kingfisher
- Amazonian Barred Woodcreeper
- Amazonian Motmot
- Amboyna Cuckoo-Dove
- American Avocet
- American Bittern
- American Black Duck
- American Bushtit
- American Cliff Swallow
- American Coot
- American Crow
- American Crow (caurinus)
- American Dipper
- American Dusky Flycatcher
- American Flamingo
- American Golden Plover
- American Goldfinch
- American Herring Gull
- American Kestrel
- American Oystercatcher
- American Pygmy Kingfisher
- American Redstart
- American Robin
- American Three-toed Woodpecker
- American Tree Sparrow
- American White Ibis
- American White Pelican
- American Wigeon
- Amethyst-throated Sunangel
- Amur Stonechat
- Ancient Murrelet
- Andean Avocet
- Andean Cock-of-the-rock
- Andean Condor
- Andean Coot
- Andean Duck
- Andean Emerald
- Andean Flamingo
- Andean Flicker
- Andean Goose
- Andean Guan
- Andean Gull
- Andean Hillstar
- Andean Lapwing
- Andean Negrito
- Andean Slaty Thrush
- Andean Solitaire
- Andean Swallow
- Andean Swift
- Andean Teal
- Andean Tit-Spinetail
- Anhinga
- Anna's Hummingbird
- Antarctic Prion
- Antarctic Shag
- Antarctic Tern
- Antillean Crested Hummingbird
- Antillean Euphonia
- Antillean Mango
- Antillean Palm Swift
- Appert's Tetraka
- Arabian Bustard
- Archbold's Bowerbird
- Archbold's Newtonia
- Arctic Redpoll
- Arctic Tern
- Arctic Warbler
- Ash-breasted Sierra Finch
- Ash-throated Crake
- Ash-throated Flycatcher
- Ashy-faced Owl
- Ashy-headed Greenlet
- Ashy-tailed Swift
- Ashy-throated Bush Tanager
- Ashy Bulbul
- Ashy Drongo
- Ashy Myzomela
- Asian Brown Flycatcher
- Asian Fairy-bluebird
- Asian Glossy Starling
- Asian Openbill
- Asian Palm Swift
- Asian Red-eyed Bulbul
- Asian Rosy Finch
- Atlantic Canary
- Atlantic Puffin
- Audubon's Oriole
- Audubon's Shearwater
- Audubon's Warbler
- Austral Blackbird
- Austral Negrito
- Austral Pygmy Owl
- Austral Thrush
- Australasian Figbird
- Australian Reed Warbler
- Azores Bullfinch
- Aztec Thrush
- Azure-hooded Jay
- Azure-winged Magpie
- Azure Kingfisher