The South American Classification Committee (SACC) of the American Ornithological Society lists 488 species of birds that have been confirmed on the islands of Trinidad and Tobago as of September 2023. Of them, two are endemic, seven have been introduced by humans, 130 are rare or vagrants, 11 have been extirpated, and the status of one is not known. The origin of one species (vagrant or introduced) is uncertain. As of December 2021 the Trinidad & Tobago Bird Status & Distribution Committee (BSDC) did not recognize three of them and had added seven, all of them vagrants.
There are few places in the world where so many bird species can be seen in such a small area, many of them unique, very rare, or of particular interest. They range from the many species of hummingbird to the cave-dwelling oilbird (which uses echo-location to fly in the dark) and the scarlet ibis.
The islands are within a few miles of Venezuela, and the species are therefore typical of tropical South America. However, the number of species is relatively low compared to the mainland, as would be expected on small islands. The resident breeding birds are augmented in the northern winter by migrants from North America, although the variety of migrant passerines is very limited compared to Central America.
Unless noted otherwise, the list of species is that of the SACC with distribution notes by the BSDC. The list's taxonomic treatment (sequence of orders, families, and species) and nomenclature (common and scientific names) are also those of the SACC.
Species in the list are common on both main islands except as indicated otherwise. Many are also present on other, small, islands which are usually not named in the list. Tobago has only about half the number of bird species of Trinidad, but several species and subspecies have occurred only on the smaller island. Some of the smaller islands off Tobago, such as Little Tobago, have important seabird breeding colonies.
Tinamous
Order: TinamiformesFamily: Tinamidae
The tinamous are one of the most ancient groups of bird. Although they look similar to other ground-dwelling birds like quail and grouse, they have no close relatives and are classified as a single family, Tinamidae, within their own order, the Tinamiformes. They are distantly related to the ratites (order Struthioniformes), that includes the rheas, emus, and kiwis.
Screamers
Order: AnseriformesFamily: Anhimidae
The screamers are a small family of birds related to the ducks. They are large, bulky birds, with a small downy head, long legs and large feet which are only partially webbed. They have large spurs on their wings which are used in fights over mates and in territorial disputes.
Ducks
Order: AnseriformesFamily: Anatidae
Anatidae includes the ducks and most duck-like waterfowl, such as geese and swans. These birds are adapted to an aquatic existence with webbed feet, flattened bills, and feathers that are excellent at shedding water due to an oily coating.
Guans
Order: GalliformesFamily: Cracidae
The Cracidae are large birds, similar in general appearance to turkeys. The guans and curassows live in trees, but the smaller chachalacas are found in more open scrubby habitats. They are generally dull-plumaged, but the curassows and some guans have colorful facial ornaments.
Flamingos
Order: PhoenicopteriformesFamily: Phoenicopteridae
Flamingos are gregarious wading birds, usually tall, found in both the Western and Eastern Hemispheres. Flamingos filter-feed on shellfish and algae. Their oddly shaped beaks are specially adapted to separate mud and silt from the food they consume and, uniquely, are used upside-down.
Grebes
Order: PodicipediformesFamily: Podicipedidae
Grebes are small to medium-large freshwater diving birds. They have lobed toes and are excellent swimmers and divers. However, they have their feet placed far back on the body, making them quite ungainly on land.
Pigeons
Order: ColumbiformesFamily: Columbidae
Pigeons and doves are stout-bodied birds with short necks and short slender bills with a fleshy cere.
Cuckoos
Order: CuculiformesFamily: Cuculidae
The family Cuculidae includes cuckoos, roadrunners, and anis. These birds are of variable size with slender bodies, long tails, and strong legs.
Oilbird
Order: SteatornithiformesFamily: Steatornithidae
The oilbird is a slim, long-winged bird related to the nightjars. It is nocturnal and a specialist feeder on the fruit of the oil palm.