- Tywi Estuary including Taf and Gwendraeth Estuaries
- Tywi Estuary including Taf and Gwendraeth Estuaries Wales
- U.K.
- U.S.
- U.S.A
- U.S. Virgin Islands
- UAE
- UK
- US
- USA
- US Virgin Islands
- Ua Pou Monarch
- Uahuka Monarch
- Uapou Monarch
- Udawatta Kele
- Udawatta Kele Sanctuary
- Udawattakele
- Udzungwa Forest Partridge
- Udzungwa Partridge
- Uganda
- Uganda Spotted Woodpecker
- Uganda Wood-Warbler
- Uganda Wood Warbler
- Uganda Woodland-Warbler
- Uganda Woodland Warbler
- Uhehe Fiscal
- Ukraine
- Ula-ai-hawane
- Ultramarine Flycatcher
- Ultramarine Grosbeak
- Ultramarine Jay
- Ultramarine Kingfisher
- Ultramarine Lorikeet
- Ultravid 10x42
- Ultravid 8x20 BL
- Ulubat Golu (Lake Apolyont)
- Ulubat Golu (Lake Apolyont) Turkey
- Uludag National Park
- Uludag National Park Turkey
- Uluguru Bush-shrike
- Uluguru Bushshrike
- Uluguru Greenbul
- Uluguru Violet-backed Sunbird
- Ulva Island
- Ulva Island(South of New Zealand)
- Umbrella Cockatoo
- Unadorned Flycatcher
- Undulated Antpitta
- Undulated Antshrike
- Undulated Tinamou
- Unicolored Antwren
- Unicolored Blackbird
- Unicolored Jay
- Unicolored Tapaculo
- Unicolored Thrush
- Unicoloured Jay
- Unicoloured Thrush
- Uniform Antshrike
- Uniform Bowerbird
- Uniform Crake
- Uniform Finch
- Uniform Swiftlet
- Uniform Treehunter
- Uniform Woodcreeper
- United Arab Emirates
- United Kingdom
- United States
- United States of America
- Unspotted Saw-whet Owl
- Unst
- Unst Shetland Islands
- Unst Shetland Islands, Scotland
- Unstreaked Tit-Tyrant
- Unstreaked Tit Tyrant
- Unteres Odertal Nationalpark River Oder (Brandenburg)
- Upcher's Warbler
- Upland Antshrike
- Upland Buzzard
- Upland Goose
- Upland Pipit
- Upland Sandpiper
- Upper Derwent Valley
- Upper Magdalena Tapaculo
- Upper Newport Bay Ecological Reserve
- Upper Newport Bay Ecological Reserve(Orange County)
- Upper Rio Napo
- Upper Vistula River Valley
- Upper Vistula River Valley(Southern Poland, Silesia region)
- Upper khumbu(sagaramatha national park)
- Upton Warren
- Upton Warren(Worcestershire)
- Upucerthia
- Upucerthia albigula
- Upucerthia andaecola
- Upucerthia certhioides
- Upucerthia dumetaria
- Upucerthia harterti
- Upucerthia jelskii
- Upucerthia ruficaudus
- Upucerthia saturatior
- Upucerthia serrana
- Upucerthia validirostris
- Upupa
- Upupa Africana
- Upupa Epops
- Upupa africana
- Upupa epops
- Upupa epops africana
- Upupa epops saturata
- Upupa marginata
- Upupidae
- Uracca Jay
- Uraeginthus
- Uraeginthus angolensis
- Uraeginthus bengalus
- Uraeginthus cyanocephalus
- Uraeginthus granatina
- Uraeginthus granatinus
- Uraeginthus ianthinogaster
- Uragus
- Uragus sibiricus
- Uragus sibiricus ussuriensis
- Ural Owl
- Uratelornis
- Uratelornis chimaera
- Uria
- Uria aalge
- Uria lomvia
- Urich's Tyrannulet
- Urim
- Urim Israel
- Urochroa
- Urochroa bougueri
- Urochroa bougueri bougueri
- Urochroa leucura
- Urocissa
- Urocissa caerulea
- Urocissa erythrorhyncha
- Urocissa erythroryncha
- Urocissa flavirostris
- Urocissa ornata
- Urocissa whiteheadi
- Urocolius
- Urocolius indicus
- Urocolius macrourus
- Urocynchramidae
- Urocynchramus
- Urocynchramus pylzowi
- Urodrepanis eximia
- Urodynamis
- Urodynamis taitensis
- Uroglaux
- Uroglaux dimorpha
- Urolais
- Urolais epichlora
- Urolestes
- Urolestes melanoleucus
- Uromyias agilis
- Uromyias agraphia
- Uropelia
- Uropelia campestris
- Uropsalis
- Uropsalis lyra
- Uropsalis segmentata
- Uropsila
- Uropsila leucogastra
- Urorhipis
- Urorhipis rufifrons
- Urosphena
- Urosphena neumanni
- Urosphena pallidipes
- Urosphena squameiceps
- Urosphena subulata
- Urosphena whiteheadi
- Urosticte
- Urosticte benjamini
- Urosticte ruficrissa
- Urothraupis
- Urothraupis stolzmanni
- Urotriorchis
- Urotriorchis macrourus
- Urrao Antpitta
- Ursula's Sunbird
- Urubitinga coronata
- Uruguay
- Usambara Akalat
- Usambara Double-collared Sunbird
- Usambara Eagle-Owl
- Usambara Eagle Owl
- Usambara Greenbul
- Usambara Hyliota
- Usambara Thrush
- Usambara Weaver
- Usambara or Nduk Eagle Owl
- Usambiro Barbet
- Ussher's Flycatcher
- Ussher's Spine-tailed Swift
- Ussher's Spinetail
- Ussuri Bullfinch
- Ussury Bullfinch
- Utah
- Utsira
- Utsira Norway
- Uttoxeter Quarry
- Uvea
- Uzbekistan
- Vadehavet Bird Sanctuary
- Vadehavet Bird Sanctuary Denmark
- Vadnais-Snail Lakes Regional Park
- Vadvetjakko National Park
- Vadvetjakko National Park Sweden
- Valia Kalda National Park
- Valia Kalda National Park Greece
- Vallee de la Restonica
- Vallee de la Restonica Corsica
- Vallee de la Restonica Corsica, France
- Valli di Comacchio (and surrounding area) Italy
- Valli di Comacchio and surrounding area
- Vampire Ground-Finch
- Vampire Ground Finch
- Van Dam's Vanga
- Van Hasselt's Sunbird
- Van Hesselt's Sunbird
- Van den Bosch's Pitta
- Vancouver Pygmy-Owl
- Vancouver Pygmy Owl
- Vanderbilt's Babbler
- Vane Farm
- Vane Farm RSPB Reserve Scotland
- Vanellus
- Vanellus Armatus
- Vanellus Leucurus
- Vanellus Miles
- Vanellus Vanellus
- Vanellus albiceps
- Vanellus armatus
- Vanellus cayanus
- Vanellus chilensis
- Vanellus chilensis cayennensis
- Vanellus chilensis lampronotus
- Vanellus cinerea
- Vanellus cinereus
- Vanellus coronatus
- Vanellus coronatus coronatus
- Vanellus crassirostris
- Vanellus duvaucelii
- Vanellus gregarius
- Vanellus indicus
- Vanellus indicus lankae
- Vanellus leucurus
- Vanellus lugubris
- Vanellus macropterus
- Vanellus malabaricus
- Vanellus malabaricus.
- Vanellus malarbaricus
- Vanellus melanocephalus
- Vanellus melanopterus
- Vanellus melanopterus minor
- Vanellus miles
- Vanellus miles miles
- Vanellus miles novaehollandiae
- Vanellus resplendens
- Vanellus senegallus
- Vanellus spinosus
- Vanellus superciliosus
- Vanellus tectus
- Vanellus tricolor
- Vanellus vanellus
- Vanga
- Vanga Flycatcher
- Vanga curvirostris
- Vangidae
- Vanikoro Broadbill
- Vanikoro Flycatcher
- Vanikoro Monarch
- Vanikoro Myiagra
- Vanikoro Swiftlet
- Vanikoro White-eye
- Vanoise National Park
- Vanoise National Park France
- Vansda National Park
- Vanuatu
- Vanuatu Honeyeater
- Vanuatu Imperial Pigeon
- Vanuatu Kingfisher
- Vanuatu Megapode
- Vanuatu Petrel
- Vanuatu Scrubfowl
- Vanuatu Thicketbird
- Vanuatu Whistler
- Vanuatu White-eye
- Varanger Peninsula and Fjord
- Varanger Peninsula and Fjord Norway
- Varghello Valley
- Varghello Valley Corsica
- Varghello Valley Corsica, France
- Variable Antshrike
- Variable Chachalaca
- Variable Dwarf Kingfisher
- Variable Goshawk
- Variable Hawk
- Variable Indigobird
- Variable Kingfisher
- Variable Mountain-gem
- Variable Mountain Gem
- Variable Oriole
- Variable Oystercatcher
- Variable Pitohui
- Variable Screech-Owl
- Variable Screech Owl
- Variable Seedeater
- Variable Sunbird
- Variable Wheatear
- Variable White-eye
- Variable or Dusky Indigobird
- Varied Bunting
- Varied Crow-Shrike
- Varied Honeyeater
- Varied Lorikeet
- Varied Sittella
- Varied Solitaire
- Varied Thrush
- Varied Tit
- Varied Triller
- Variegated Antpitta
- Variegated Bristle-Tyrant
- Variegated Bristle Tyrant
- Variegated Fairywren
- Variegated Flycatcher
- Variegated Fulvetta
- Variegated Laughing-thrush
- Variegated Laughingthrush
- Variegated Tinamou
- Varzea Piculet
- Varzea Schiffornis
- Varzea Thrush
- Vasa Parrot
- Vasconcellea pubescens
- Vaurie's Nightjar
- Vauriella
- Vauriella albigularis
- Vauriella goodfellowi
- Vauriella gularis
- Vauriella insignis
- Vaux's Swift


