- Treron apicauda
- Treron aromaticus
- Treron australis
- Treron axillaris
- Treron bicincta
- Treron bicinctus
- Treron bicinctus leggei
- Treron calva
- Treron calvus
- Treron capellei
- Treron chloropterus
- Treron curvirostra
- Treron floris
- Treron formosae
- Treron fulvicollis
- Treron griseicauda
- Treron griseicauda griseicauda
- Treron griseicauda wallacei
- Treron griveaudi
- Treron olax
- Treron oxyura
- Treron oxyurus
- Treron pembaensis
- Treron permagnus
- Treron phayrei
- Treron phoenicoptera
- Treron phoenicopterus
- Treron pompadora
- Treron psittacea
- Treron riukiuensis
- Treron sanctithomae
- Treron seimundi
- Treron sieboldii
- Treron sphenura
- Treron sphenurus
- Treron teysmannii
- Treron vernans
- Treron waalia
- Tres Marias Amazon
- Tri-colored Heron
- Tribonyx
- Tribonyx mortierii
- Tribonyx ventralis
- Trichastoma
- Trichastoma albipectus
- Trichastoma bicolor
- Trichastoma celebense
- Trichastoma cinereiceps
- Trichastoma fulvescens
- Trichastoma malaccense
- Trichastoma rostratum
- Trichastoma rufipennis
- Trichastoma woodi
- Trichixos
- Trichixos pyrropygus
- Trichocichla
- Trichocichla rufa
- Trichodere
- Trichodere cockerelli
- Trichoglossus
- Trichoglossus Moluccanus
- Trichoglossus capistratus
- Trichoglossus chlorolepidotus
- Trichoglossus euteles
- Trichoglossus flavoviridis
- Trichoglossus flavoviridis meyeri
- Trichoglossus forsteni
- Trichoglossus haematodus
- Trichoglossus haematodus massena
- Trichoglossus haematodus rosenbergii
- Trichoglossus johnstoniae
- Trichoglossus moluccanus
- Trichoglossus ornatus
- Trichoglossus rosenbergii
- Trichoglossus rubiginosus
- Trichoglossus rubritorquis
- Trichoglossus weberi
- Tricholaema
- Tricholaema diademata
- Tricholaema frontata
- Tricholaema hirsuta
- Tricholaema lacrymosa
- Tricholaema leucomelas
- Tricholaema melanocephala
- Tricholestes
- Tricholestes criniger
- Tricholimnas sylvestris
- Trichothraupis
- Trichothraupis melanops
- Triclaria
- Triclaria malachitacea
- Tricolored Blackbird
- Tricolored Brush-Finch
- Tricolored Brush Finch
- Tricolored Brushfinch
- Tricolored Heron
- Tricolored Munia
- Tricolored Parrot-Finch
- Tricolored Parrotfinch
- Tricolored or Louisiana Heron
- Tricoloured Brush-Finch
- Tricoloured Brush Finch
- Tricoloured Heron
- Tricoloured Munia
- Tricoloured Parrotfinch
- Triglav National Park
- Triglav National Park Slovenia
- Trigonoceps
- Trigonoceps occipitalis
- Trigradski Gorge
- Trigradski Gorge Bulgaria
- Trilling Cisticola
- Trilling Shrike-Babbler
- Trilling Shrike Babbler
- Trilling Tailorbird
- Trilling Tapaculo
- Trindade Petrel
- Tringa
- Tringa brevipes
- Tringa erythropus
- Tringa flavipes
- Tringa glareola
- Tringa guttifer
- Tringa hypoleucos
- Tringa incana
- Tringa melanoleuca
- Tringa nebularia
- Tringa ochropus
- Tringa semipalmata
- Tringa semipalmata inornata
- Tringa solitaria
- Tringa solitaria solitaria
- Tringa stagnatilis
- Tringa totanus
- Trinidad
- Trinidad Euphonia
- Trinidad Motmot
- Trinidad Piping-Guan
- Trinidad Piping Guan
- Trinidad and Tobago
- Tristan Albatross
- Tristan Moorhen
- Tristan Penguin
- Tristan Thrush
- Tristram's Bunting
- Tristram's Flowerpecker
- Tristram's Grackle
- Tristram's Honeyeater
- Tristram's Myzomela
- Tristram's Red-winged Starling
- Tristram's Starling
- Tristram's Storm-Petrel
- Tristram's Storm Petrel
- Tristram's Warbler
- Tristram's storm-petrel
- Trocaz Pigeon
- Trochalopteron
- Trochalopteron affine
- Trochalopteron austeni
- Trochalopteron austeni austeni
- Trochalopteron cachinnans
- Trochalopteron chrysopterum
- Trochalopteron chrysopterum chrysopterum
- Trochalopteron elliotii
- Trochalopteron erythrocephalum
- Trochalopteron fairbanki
- Trochalopteron formosum
- Trochalopteron henrici
- Trochalopteron imbricatum
- Trochalopteron lineatum
- Trochalopteron melanostigma
- Trochalopteron milnei
- Trochalopteron morrisonianum
- Trochalopteron ngoclinhense
- Trochalopteron ngoclinhensis
- Trochalopteron peninsulae
- Trochalopteron squamatum
- Trochalopteron subunicolor
- Trochalopteron variegatum
- Trochalopteron virgatum
- Trochalopteron yersini
- Trochilidae
- Trochilus
- Trochilus polytmus
- Trochilus polytmus polytmus
- Trochilus scitulus
- Trochocercus
- Trochocercus albiventris
- Trochocercus albonotatus
- Trochocercus cyanomelas
- Trochocercus nigromitratus
- Trochocercus nitens
- Troglodytes
- Troglodytes aedon
- Troglodytes aedon chilensis
- Troglodytes aedon musculus
- Troglodytes aedon parkmanii
- Troglodytes aedon tobagensis
- Troglodytes cobbi
- Troglodytes hiemalis
- Troglodytes monticola
- Troglodytes ochraceus
- Troglodytes pacificus
- Troglodytes rufociliatus
- Troglodytes rufulus
- Troglodytes solstitialis
- Troglodytes solstitialis solstitialis
- Troglodytes tanneri
- Troglodytes troglodytes
- Troglodytes troglodytes hirtensis
- Troglodytes troglodytes indigenus
- Troglodytes troglodytes taivanus
- Troglodytes troglodytes troglodytes
- Troglodytes troglodytes zetlandicus
- Troglodytidae
- Trogon
- Trogon aurantiiventris
- Trogon bairdii
- Trogon caligatus
- Trogon chionurus
- Trogon citreolus
- Trogon clathratus
- Trogon collaris
- Trogon collaris castaneus
- Trogon comptus
- Trogon curucui
- Trogon elegans
- Trogon massena
- Trogon massena hoffmanni
- Trogon melanocephalus
- Trogon melanurus
- Trogon melanurus eumorphus
- Trogon mesurus
- Trogon mexicanus
- Trogon personatus
- Trogon personatus assimilis
- Trogon ramonianus
- Trogon ramonianus ramonianus
- Trogon rufus
- Trogon surrucura
- Trogon surrucura aurantius
- Trogon violaceus
- Trogon violaceus violaceus
- Trogon viridis
- Trogon viridis viridis
- Trogonidae
- Trogoniformes
- Trondheim
- Troodos Mountains
- Troodos Mountains Cyprus
- Tropeiro Seedeater
- Tropical Boubou
- Tropical Boubou Shrike
- Tropical Gnatcatcher
- Tropical Kingbird
- Tropical Mockingbird
- Tropical Parula
- Tropical Pewee
- Tropical Screech-Owl
- Tropical Screech Owl
- Tropical Scrubwren
- Tropical Shearwater
- Tropical or Beccari's Scrubwren
- Tropicbird
- Tropicbirds
- Tropicranus
- Tropicranus albocristatus
- Trossachs
- Troupial
- Trudeau's Tern
- Trugon
- Trugon terrestris
- Truk Broadbill
- Truk Islands Ground Dove
- Truk Monarch
- Truk Myiagra
- Truk Myiagra Flycatcher
- Truk White-eye
- Trumland
- Trumland Orkney Islands
- Trumland RSPB Reserve Orkney Islands, Scotland
- Trumpet Manucode
- Trumpetbird
- Trumpeter
- Trumpeter Finch
- Trumpeter Hornbill
- Trumpeter Swan
- Trumpeters
- Trunvel Nature Reserve
- Trunvel Nature Reserve France
- Tryggelev Nor
- Tryngites
- Tryngites subruficollis
- Tsai Yuan Jiu Yuan Wetland
- Tsai Yuan Jiu Yuan Wetland(Penghu Islands(Pescadores) , Taiwan ,)
- Tsavo Sunbird
- Tschudi's Nightjar
- Tschudi's Tapaculo
- Tschudi's Tyrannulet
- Tschudi's Woodcreeper
- Tsingy Wood-Rail
- Tsingy Wood Rail
- Tuamoto Kingfisher
- Tuamotu Kingfisher
- Tuamotu Reed-Warbler
- Tuamotu Reed Warbler
- Tuamotu Sandpiper
- Tuamotu Warbler
- Tubenoses
- Tucker Wildlife Sanctuary
- Tucker Wildlife Sanctuary(Orange County)
- Tucson
- Tucson(Southern Arizona)
- Tucuman Amazon
- Tucuman Mountain-Finch
- Tucuman Mountain Finch
- Tucuman Parrot
- Tucuman Pygmy-Owl
- Tucuman Pygmy Owl
- Tudeley Woods
- Tudeley Woods RSPB Reserve (Kent)
- Tufted Antshrike
- Tufted Coquette
- Tufted Duck
- Tufted Flycatcher
- Tufted Jay
- Tufted Myna
- Tufted Mynah
- Tufted Olive Sunbird
- Tufted Puffin
- Tufted Tit-Spinetail
- Tufted Tit-Tyrant
- Tufted Tit Spinetail
- Tufted Tit Tyrant
- Tufted Titmouse
- Tui
- Tui Parakeet
- Tullberg's Woodpecker
- Tumaco Seedeater
- Tumbes Hummingbird
- Tumbes Pewee
- Tumbes Screech Owl
- Tumbes Sparrow
- Tumbes Swallow
- Tumbes Tyrannulet


