This is a list of the bird species recorded in the British Indian Ocean Territory. The avifauna of the British Indian Ocean Territory include a total of 136 species, of which 6 have been introduced by humans.
This list's taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (common and scientific names) follow the conventions of The Clements Checklist of the Birds of the World, 2022 edition. The family accounts at the beginning of each heading reflect this taxonomy, as do the species counts found in each family account. Introduced and accidental species are included in the total counts for the British Indian Ocean Territory. The British Indian Ocean Territory consists of islands of the Chagos Archipelago, the largest of which is Diego Garcia which has a military base on it. The public is not allowed on any of the islands.
The following tags have been used to highlight several categories, but not all species fall into one of these categories. Those that do not are commonly occurring native species.
(A) Accidental - a species that rarely or accidentally occurs in British Indian Ocean Territory (I) Introduced - a species introduced to British Indian Ocean Territory as a consequence, direct or indirect, of human actions
Ducks, geese, and waterfowl 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.
Australian shelduck, Tadorna tadornoides (A) Cotton pygmy-goose, Nettapus coromandelianus (A) Garganey, Spatula querquedula Mallard, Anas platyrhynchos (I) Northern pintail, Anas acuta (A)
Guineafowl Order: GalliformesFamily: Numididae
Guineafowl are a group of African, seed-eating, ground-nesting birds that resemble partridges, but with featherless heads and spangled grey plumage.
Helmeted guineafowl, Numida meleagris (I)
Pheasants, grouse, and allies Order: GalliformesFamily: Phasianidae
The Phasianidae are a family of terrestrial birds which consists of quails, partridges, snowcocks, francolins, spurfowls, tragopans, monals, pheasants, peafowls and jungle fowls. In general, they are plump (although they vary in size) and have broad, relatively short wings.
Red junglefowl, Gallus gallus (I)
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.
Greater flamingo, Phoenicopterus roseus (A)
Pigeons and doves Order: ColumbiformesFamily: Columbidae
Pigeons and doves are stout-bodied birds with short necks and short slender bills with a fleshy cere.
Rock pigeon, Columba livia (I) Malagasy turtle-dove, Nesoenas picturatus (I) Zebra dove, Geopelia striata (I)
Swifts Order: CaprimulgiformesFamily: Apodidae
Swifts are small birds which spend the majority of their lives flying. These birds have very short legs and never settle voluntarily on the ground, perching instead only on vertical surfaces. Many swifts have long swept-back wings which resemble a crescent or boomerang.
White-throated needletail, Hirundapus caudacutus Common swift, Apus apus Pacific swift, Apus pacificus (A)
Rails, gallinules and coots Order: GruiformesFamily: Rallidae
Rallidae is a large family of small to medium-sized birds which includes the rails, crakes, coots and gallinules. Typically they inhabit dense vegetation in damp environments near lakes, swamps or rivers. In general they are shy and secretive birds, making them difficult to observe. Most species have strong legs and long toes which are well adapted to soft uneven surfaces. They tend to have short, rounded wings and to be weak fliers.
Eurasian moorhen, Gallinula chloropus (A) Watercock, Gallicrex cinerea White-breasted waterhen, Amaurornis phoenicurus
Stilts and avocets Order: CharadriiformesFamily: Recurvirostridae
Recurvirostridae is a family of large wading birds, which includes the avocets and stilts. The avocets have long legs and long up-curved bills. The stilts have extremely long legs and long, thin, straight bills.
Black-winged stilt, Himantopus himantopus (A)
Plovers and lapwings Order: CharadriiformesFamily: Charadriidae
The family Charadriidae includes the plovers, dotterels and lapwings. They are small to medium-sized birds with compact bodies, short, thick necks and long, usually pointed, wings. They are found in open country worldwide, mostly in habitats near water.
Black-bellied plover, Pluvialis squatarola Pacific golden-plover, Pluvialis fulva Lesser sand-plover, Charadrius mongolus Greater sand-plover, Charadrius leschenaultii Kentish plover, Charadrius alexandrinus Common ringed plover, Charadrius hiaticula Little ringed plover, Charadrius dubius Oriental plover, Charadrius veredus
Sandpipers and allies Order: CharadriiformesFamily: Scolopacidae
Scolopacidae is a large diverse family of small to medium-sized shorebirds including the sandpipers, curlews, godwits, shanks, tattlers, woodcocks, snipes, dowitchers and phalaropes. The majority of these species eat small invertebrates picked out of the mud or soil. Variation in length of legs and bills enables multiple species to feed in the same habitat, particularly on the coast, without direct competition for food.
Whimbrel, Numenius phaeopus Far Eastern curlew, Numenius madagascariensis Eurasian curlew, Numenius arquata Bar-tailed godwit, Limosa lapponica Black-tailed godwit, Limosa limosa Ruddy turnstone, Arenaria interpres Ruff, Calidris pugnax Sharp-tailed sandpiper, Calidris acuminata Curlew sandpiper, Calidris ferruginea Temminck's stint, Calidris temminckii Long-toed stint, Calidris subminuta Red-necked stint, Calidris ruficollis Sanderling, Calidris alba Dunlin, Calidris alpina Little stint, Calidris minuta Pectoral sandpiper, Calidris melanotos Common snipe, Gallinago gallinago Pin-tailed snipe, Gallinago stenura Terek sandpiper, Xenus cinereus Red-necked phalarope, Phalaropus lobatus Common sandpiper, Actitis hypoleucos Green sandpiper, Tringa ochropus Gray-tailed tattler, Tringa brevipes Spotted redshank, Tringa erythropus Common greenshank, Tringa nebularia Marsh sandpiper, Tringa stagnatilis Wood sandpiper, Tringa glareola Common redshank, Tringa totanus
Crab plover Order: CharadriiformesFamily: Dromadidae
The crab plover is related to the waders. It resembles a plover but with very long grey legs and a strong heavy black bill similar to a tern. It has black-and-white plumage, a long neck, partially webbed feet and a bill designed for eating crabs.
Crab-plover, Dromas ardeola
Pratincoles and coursers Order: CharadriiformesFamily: Glareolidae
Glareolidae is a family of wading birds comprising the pratincoles, which have short legs, long pointed wings and long forked tails, and the coursers, which have long legs, short wings and long, pointed bills which curve downwards.
Collared pratincole, Glareola pratincola Oriental pratincole, Glareola maldivarum
Skuas and jaegers Order: CharadriiformesFamily: Stercorariidae
The family Stercorariidae are, in general, medium to large birds, typically with grey or brown plumage, often with white markings on the wings. They nest on the ground in temperate and arctic regions and are long-distance migrants.
South polar skua, Stercorarius maccormicki (A) Pomarine jaeger, Stercorarius pomarinus Parasitic jaeger, Stercorarius parasiticus
Gulls, terns, and skimmers Order: CharadriiformesFamily: Laridae
Laridae is a family of medium to large seabirds, the gulls, terns and skimmers. Gulls are typically gray or white, often with black markings on the head or wings. They have stout, longish bills and webbed feet. Terns are a group of generally medium to large seabirds typically with gray or white plumage, often with black markings on the head. Most terns hunt fish by diving but some pick insects off the surface of fresh water. Terns are generally long-lived birds, with several species known to live in excess of 30 years. Skimmers are a small family of tropical tern-like birds. They have an elongated lower mandible which they use to feed by flying low over the water surface and skimming the water for small fish.
Lesser black-backed gull, Larus fuscus (A) Kelp gull, Larus dominicanus Brown noddy, Anous stolidus Lesser noddy, Anous tenuirostris White tern, Gygis alba Sooty tern, Onychoprion fuscatus Bridled tern, Onychoprion anaethetus Little tern, Sternula albifrons Saunders's tern Sternula saundersi Gull-billed tern Gelochelidon nilotica Black tern, Chlidonias niger White-winged tern, Chlidonias leucopterus Whiskered tern, Chlidonias hybrida (A) Roseate tern, Sterna dougallii Black-naped tern, Sterna sumatrana Common tern, Sterna hirundo Arctic tern, Sterna paradisaea White-cheeked tern, Sterna repressa Great crested tern, Thalasseus bengalensis Lesser crested tern, Thalasseus bergii
Tropicbirds Order: PhaethontiformesFamily: Phaethontidae
Tropicbirds are slender white birds of tropical oceans, with exceptionally long central tail feathers. Their heads and long wings have black markings.
White-tailed tropicbird, Phaethon lepturus Red-billed tropicbird, Phaethon aethereus Red-tailed tropicbird, Phaethon rubricauda
Southern storm-petrels Order: ProcellariiformesFamily: Oceanitidae
The southern storm-petrels are the smallest seabirds, relatives of the petrels, feeding on planktonic crustaceans and small fish picked from the surface, typically while hovering. Their flight is fluttering and sometimes bat-like.
Wilson's storm-petrel, Oceanites oceanicus White-faced storm-petrel, Pelagodroma marina Black-bellied storm-petrel, Fregetta tropica
Northern storm-petrels Order: ProcellariiformesFamily: Hydrobatidae
Though the members of this family are similar in many respects to the southern storm-petrels, including their general appearance and habits, there are enough genetic differences to warrant their placement in a separate family.
Swinhoe's storm-petrel, Hydrobates monorhis Matsudaira's storm-petrel, Hydrobates matsudairae
Shearwaters and petrels Order: ProcellariiformesFamily: Procellariidae
The procellariids are the main group of medium-sized "true petrels", characterised by united nostrils with medium nasal septum, and a long outer functional primary flight feather.
Southern giant-petrel, Macronectes giganteus (A) Bulwer's petrel, Bulweria bulwerii Jouanin's petrel, Bulweria fallax Tahiti petrel, Pseudobulweria rostrata Flesh-footed shearwater, Ardenna carneipes Wedge-tailed shearwater, Ardenna pacificus Tropical shearwater, Puffinus bailloni Persian shearwater, Puffinus persicus (A)
Frigatebirds Order: SuliformesFamily: Fregatidae
Frigatebirds are large seabirds usually found over tropical oceans. They are large, black, or black-and-white, with long wings and deeply forked tails. The males have coloured inflatable throat pouches. They do not swim or walk and cannot take off from a flat surface. Having the largest wingspan-to-body-weight ratio of any bird, they are essentially aerial, able to stay aloft for more than a week.
Lesser frigatebird, Fregata ariel Great frigatebird, Fregata minor
Boobies and gannets Order: SuliformesFamily: Sulidae
The sulids comprise the gannets and boobies. Both groups are medium-large coastal seabirds that plunge-dive for fish.
Masked booby, Sula dactylatra Brown booby, Sula leucogaster Red-footed booby, Sula sula Abbott's booby, Papasula abbotti (A)
Herons, egrets, and bitterns Order: PelecaniformesFamily: Ardeidae