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Females significantly larger than males, and Caribbean populations generally a little larger than more westerly populations. Both sexes and all age-groups have:
Immature White head and underparts, rest of bird black
 Similar species
On a sitting female, black on the chin and throat makes a dark arrow pointing into the white breast, and on a flying bird, the border seems perpendicular to the flight direction. On a female Great Frigatebird, the white breast points into the black, almost reaching the bill. Up close, look for different color of eye ring
Pelagic species; at sea, and commonly along coastlines. Is not bothered by human settlement, and may benefit from human activities such as fishing.
Diet includes fish, especially flying fish, which are taken in flight. Will attack other seabirds to steal their catches or try to force them to disgorge their meals. Will also snatch offal, such as fish entrails discarded by fishermen, from the surface of the sea.
The male attends the nest for about 100 days, while the female stays with the single offspring for approximately another year; most of that time, the young stay in the nest. The female is therefore only able to breed every other year, while males may breed every year or maybe even more often in different colonies.
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