any of a family (Fregatidae) of large, tropical pelecaniform birds with extremely long wings and tail and a hooked beak: it commonly robs other birds of their prey
See frigate bird in American Heritage Dictionary 4
noun
Any of various tropical sea birds of the family Fregatidae that have long powerful wings, dark plumage, and a hooked beak and characteristically snatch food from other birds in flight. Also called man-o'-war bird.