tropical and subtropical islands off nw Africa, n South Atlantic, Persian Gulf region, se Vietnam, nw Mexico to Ecuador, and Caribbean
Nonbreeding Range Subregions
pelagic in tropical and subtropical oceans: in Gulf Stream n to North Carolina (w North Atlantic), far out to sea in Atlantic, nw Indian Ocean to w Indian coast, c California to c Chile (e Pacific)
Antigua and Barbuda,Bahamas,Brazil,British Virgin Islands,Cape Verde,Chile,China,Colombia,Costa Rica,Democratic Republic of Congo, Djibouti,Dominican Republic,Ecuador - Galapagos Islands,Ecuador - mainland,Egypt,El Salvador,Eritrea,Ethiopia,Gabon,Gambia, Guatemala,Guinea,Guinea-Bissau,Haiti,Honduras,India - mainland,Iran,Iraq,Liberia,Madagascar, Malaysia,Marshall Islands,Mauritania,Mexico,Montserrat,Myanmar,Netherlands Antilles,Nicaragua,Nigeria,Oman, Pakistan,Palestine,Panama,Peru,Puerto Rico,Qatar,Saint Helena,Saudi Arabia,Senegal,Somalia, South Sudan,Spain,Sri Lanka,Sudan,Trinidad and Tobago,United Arab Emirates,United States - mainland,Venezuela,Vietnam,Virgin Islands, Yemen,
IOC 13.1 Subspecies
Group
Subspecies
Breeding Range
mesonauta
tropical e North Atlantic, e Pacific and Caribbean islands: in Atlantic, Cape Verde Is. (s Macaronesia, w of nw Africa) and Is. de la Madeleine (just off Senegal, w Africa); in e Pacific, Rocas Alijos (w of sw Baja California), islands in Gulf of Californ
aethereus
tropical South Atlantic islands: Fernando de Noronha (ne of ne Brazil), Abrolhos Is. (off se Brazil; wc South Atlantic), Ascension and St. Helena (tropical se Atlantic Ocean)
indicus
tropical Indian Ocean marginal seacoasts: coastal Red Sea, Gulf of Aden, Socotra, off ne Somalia, off e coast of Arabian Pen., and Persian Gulf; also Con Dao Is. (se of Vietnam)
Africa (entire continent rather than south of Sahara)
AN
Antarctica
AO
Atlantic Ocean
AU
Australasia (Wallacea (Indonesian islands east of Wallace's line), New Guinea and its islands, Australia, New Zealand and its subantarctic islands, the Solomons, New Caledonia, and Vanuatu)
PAL
Eurasia (Europe, Asia from the Middle East through central Asia north of the Himalayas, Siberia and northern China to Japan)
IO
Indian Ocean
LA
Latin America (Middle and South America)
MA
Middle America (Mexico through Panama)
NA
North America (includes the Caribbean)
NO
Northern oceans
OR
Oriental Region (South Asia from Pakistan to Taiwan, plus Southeast Asia, the Philippines, and Greater Sundas)