| Common Name | Scientific name |
|---|---|
| Townsend's Warbler | Setophaga townsendi |
| Transvolcanic Jay | Aphelocoma ultramarina |
| Tree Pipit | Anthus trivialis |
| Tree Swallow | Tachycineta bicolor |
| Tricolored Blackbird | Agelaius tricolor |
| Tricolored Heron | Egretta tricolor |
| Tricolored Munia | Lonchura malacca |
| Trindade Petrel | Pterodroma arminjoniana |
| Tristram's Starling | Onychognathus tristramii |
| Tristram's Storm-Petrel | Oceanodroma tristrami |
| Tropical Gnatcatcher | Polioptila plumbea |
| Tropical Kingbird | Tyrannus melancholicus |
| Tropical Mockingbird | Mimus gilvus |
| Tropical Parula | Setophaga pitiayumi |
| Tropical Pewee | Contopus cinereus |
| Tropical Screech-Owl | Megascops choliba |
| Trumpeter Finch | Bucanetes githagineus |
| Trumpeter Swan | Cygnus buccinator |
| Tufted Duck | Aythya fuligula |
| Tufted Flycatcher | Mitrephanes phaeocercus |
| Tufted Jay | Cyanocorax dickeyi |
| Tufted Puffin | Fratercula cirrhata |
| Tufted Titmouse | Baeolophus bicolor |
| Tundra Bean Goose | Anser serrirostris |
| Tundra Swan | Cygnus columbianus |
RingBase adheres to EURING codes.
