Description
The Great Frigatebird is a large seabird and, despite its name, it is the second largest frigatebird, after the Magnificent Frigatebird. The Great Frigatebird measures 85 to 105 centimetres (33 to 41 in) in length with long pointed wings of 205–230 cm (80.5–90.5 in) and long forked tails. The Great Frigatebird weighs from 640–1,550 g (1.4–3.4 lb).
The frigatebirds have the highest ratio of wing area to body mass, and the lowest wing loading of any bird. This has been hypothesized to enable the birds to utilize marine thermals created by small differences between tropical air and water temperatures. Male Great Frigatebirds are smaller than females, but the extent of the variation varies geographically. The plumage of males is black with scapular feathers that have a purple-green iridescence when they refract sunlight. Females are black with a white throat and breast and have a red eye ring. Juveniles are black with a rust-tinged white face, head and throat.
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