- "Alto Pisones" Tapaculo
- "Batis"
- "Bradornis"
- "Cettia"
- "Cyornis"
- "Dendroica"
- "Gallinula"
- "Heliangelus"
- "Hemispingus"
- "Leucocirca1"
- "Leucocirca2"
- "Lichmera"
- "Loxigilla"
- "Myiophobus"
- "Psitteuteles"
- "Pycnopygius"
- "Pycnosphrys"
- "Rhipidura"
- "Selenidera"
- "Zosterornis"
- 1758
- 2014
- 2016 splits and lumps
- 2314
- A- (prefix)
- ABW:Automated taxobox system/intro
- ABW:TAX
- AVES
- A Field Guide to the Birds of Devonshire
- Aachenosaurus
- Aachenosaurus multidens
- Aardonyx
- Aardonyx celestae
- Aardvark
- Aardwolf
- Abavornis bonaparti
- Abbott's
- Abbott's Babbler
- Abbott's Booby
- Abbott's Gannet
- Abbott's Starling
- Abbott's Sunbird
- Abd al-Kuri Sparrow
- Abdallahsaurus
- Abdim's Stork
- Abdomen
- Abeillia
- Abelisaurus
- Abelisaurus comahuensis
- Aberdare Cisticola
- Aberrant
- Aberrant Bush-Warbler
- Aberrant Bush-warbler
- Aberrant Bush Warbler
- Abert's Squirrel
- Abert's Towhee
- Abmigration
- Abrasion
- Abrornis
- Abroscopus
- Absolute magnitude
- Absorption
- Aburria
- Abyssal
- Abyssal plain
- Abyssal zone
- Abyssinian
- Abyssinian Catbird
- Abyssinian Crimson-wing
- Abyssinian Crimsonwing
- Abyssinian Genet
- Abyssinian Ground-Thrush
- Abyssinian Ground-thrush
- Abyssinian Ground Hornbill
- Abyssinian Ground Thrush
- Abyssinian Lark
- Abyssinian Longclaw
- Abyssinian Nightjar
- Abyssinian Owl
- Abyssinian Roller
- Abyssinian Scimitarbill
- Abyssinian Slaty-Flycatcher
- Abyssinian Slaty-flycatcher
- Abyssinian Slaty Flycatcher
- Abyssinian Thrush
- Abyssinian Waxbill
- Abyssinian Wheatear
- Abyssinian White-eye
- Abyssinian Woodpecker
- Acacia Pied-Barbet
- Acacia Pied Barbet
- Acacia Tit
- Acadian Flycatcher
- Acanthagenys
- Acanthagenys rufogularis
- Acanthidops
- Acanthis
- Acanthis (genus)
- Acanthis flammea
- Acanthisitta
- Acanthisitta chloris
- Acanthisitti
- Acanthisittidae
- Acanthiza
- Acanthizidae
- Acanthopneuste
- Acanthoptila
- Acanthorhynchinae
- Acanthorhynchus
- Acanthornis
- Accentor
- Accidental
- Accipiter
- Accipiter (tribe)
- Accipitridae
- Accipitriformes
- Accipitrimorphae
- Accipitrinae
- Accipitrine hawk
- Accipitrini
- Aceh Pheasant
- Acentrortyx
- Aceros
- Acetabulum
- Achaetops
- Acid (soil)
- Acinonyx
- Acinonyx kurteni
- Acinonyx pardinensis
- Acorn Woodpecker
- Acquisition
- Acre Antshrike
- Acre Tody-Tyrant
- Acridotheres
- Acritillas
- Acrobatidae
- Acrobatornis
- Acrocephalidae
- Acrocephalus
- Acropternis
- Acryllium
- Actenoides
- Actinodura
- Actitis
- Active galaxy
- Actophilornis
- Adamawa Turtle-Dove
- Adamawa Turtle Dove
- Adaptive radiation
- Addition
- Adelaide's Warbler
- Adelaide Rosella
- Adelie Penguin
- Adelomyia
- Adenosine triphosphate
- Adjutant
- Admirable Bolete
- Admirable Hummingbird
- Adrenal cortex
- Adult
- Adult plumage
- Adzebill
- Adélie Penguin
- Aechmophorus
- Aedonopsis
- Aegialornis
- Aegithalidae
- Aegithalos
- Aegithina
- Aegithinidae
- Aegolius
- Aegotheles
- Aegothelidae
- Aegotheliformes
- Aegypius
- Aegypius monachus
- Aenigmatolimnas
- Aepyornis
- Aepyornis gracilis
- Aepyornis hildebrandti
- Aepyornis maximus
- Aepyornis medius
- Aepyornithidae
- Aepyornithiformes
- Aepypodius
- Aequorlitornithes
- Aequornithes
- Aerie
- Aerodramus
- Aeronautes
- Aerospiza
- Aethia
- Aethopyga
- Afep Pigeon
- Afghan Babbler
- Afghan Snowfinch
- Afghan Sparrow
- Africa
- African Angelshark
- African Barred Owlet
- African Black-Swift
- African Black-headed Oriole
- African Black Duck
- African Black Swift
- African Blue-Tit
- African Blue-flycatcher
- African Blue Flycatcher
- African Blue Tit
- African Broadbill
- African Citril
- African Collared-Dove
- African Collared Dove
- African Crake
- African Crimson-winged Finch
- African Cuckoo
- African Cuckoo-Hawk
- African Darter
- African Desert-Warbler
- African Desert Warbler
- African Dusky Flycatcher
- African Dwarf Kingfisher
- African Emerald-Cuckoo
- African Emerald Cuckoo
- African Finfoot
- African Firefinch
- African Fish-Eagle
- African Fish Eagle
- African Forest-flycatcher
- African Golden Cat
- African Golden Oriole
- African Golden Weaver
- African Goshawk
- African Grass-Owl
- African Grass Hummingbird
- African Grass Owl
- African Green-Pigeon
- African Green Broadbill
- African Green Pigeon
- African Grey-Hornbill
- African Grey-Woodpecker
- African Grey Flycatcher
- African Grey Hornbill
- African Grey Parrot
- African Grey Woodpecker
- African Harrier-Hawk
- African Hawk-Eagle
- African Hill-Babbler
- African Hill Babbler
- African Hillbabbler
- African Hobby
- African Hoopoe
- African Jacana
- African Leopard
- African Long-eared Owl
- African Marsh-Harrier
- African Marsh Harrier
- African Olive-Pigeon
- African Olive Pigeon
- African Openbill
- African Oystercatcher
- African Palm-Swift
- African Palm Civet
- African Palm Swift
- African Paradise-Flycatcher
- African Penduline-tit
- African Penguin
- African Piculet
- African Pied-Hornbill
- African Pied Hornbill
- African Pied Wagtail
- African Pipit
- African Pitta
- African Pygmy-Goose
- African Pygmy-falcon
- African Pygmy-goose
- African Pygmy Goose
- African Pygmy Kingfisher
- African Quailfinch
- African Rail
- African Red-eyed Bulbul
- African Reed-Warbler
- African Reed-warbler
- African Reed Warbler
- African Ribbontail Catshark
- African River Martin
- African Rock Pipit
- African Sacred Ibis
- African Sawtail Catshark
- African Scops-Owl
- African Shrike-flycatcher
- African Silverbill
- African Skimmer
- African Snipe
- African Spoonbill
- African Spotted-Creeper
- African Stonechat
- African Swamphen
- African Tailorbird
- African Thrush
- African Wattled Lapwing
- African Wild Ass
- African Wood-Owl
- African Yellow-Warbler
- African Yellow Warbler
- African Yellow White-eye
- African angelshark
- African barbet
- African broadbill
- African giant eagle-owl
- African owlet
- African parrot
- African ribbontail catshark
- African sawtail catshark
- African spurfowl
- African starling
- African terrestrial barbet
- African thrush-babbler
- African trogon
- African vulture
- African warbler
- Afro-Eurasian starling
- Afro-Neotropical parrot
- Afroaves
- Afropavo
- Afrosoricida
- Afrotis
- Afrotropical parrot
- Afroxycheus
- Afroxyechus
- Agami Heron
- Agamia
- Agapornis
- Agapornithine parrot
- Agapornithini
- Agaricales
- Agaricus campestris
- Agelaioides
- Agelaius
- Agelaius phoeniceus
- Agelastes
- Agelasticus
- Agile Antechinus
- Agile Kangaroo Rat
- Agile Sparrowhawk
- Agile Tit-Tyrant
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