- Acorn Woodpecker
- African Blue Tit
- African Collared Dove
- Agami Heron
- Alder Flycatcher
- Alexandrine Parakeet
- Alpine Accentor
- Alpine Chough
- Alpine Swift
- Amazilia Hummingbird
- Amazon Kingfisher
- Amazonian Plain Xenops
- Amazonian Umbrellabird
- American Dipper
- American Flamingo
- American Kestrel
- American Pygmy Kingfisher
- American Redstart
- American White Ibis
- Amethyst-throated Mountaingem
- Amethyst-throated Sunangel
- Andean Avocet
- Andean Cock-of-the-rock
- Andean Condor
- Andean Coot
- Andean Duck
- Andean Emerald
- Andean Flicker
- Andean Goose
- Andean Gull
- Andean Lapwing
- Andean Motmot
- Andean Negrito
- Andean Potoo
- Andean Pygmy Owl
- Andean Solitaire
- Andean Swallow
- Andean Swift
- Anhinga
- Aplomado Falcon
- Apurimac Brushfinch
- Aquatic Warbler
- Araucaria Tit-Spinetail
- Arctic Tern
- Arctic Warbler
- Armenian Gull
- Ash-breasted Sierra Finch
- Ash-breasted Tit-Tyrant
- Ashy-tailed Swift
- Atlantic Canary
- Atlantic Petrel
- Atlantic Puffin
- Atlantic Yellow-nosed Albatross
- Audouin's Gull
- Austral Negrito
- Austral Pygmy Owl
- Austral Thrush
- Azara's Spinetail
- Azores Bullfinch
- Azores Chaffinch
- Azure-crowned Hummingbird
- Azure-rumped Tanager
- Azure Gallinule