The Gannets and Boobies (Sulidae) comprises 10 species of medium-large coastal seabirds that plunge-dive for fish and similar prey.

The sulids are distributed mainly in tropical and subtropical waters. Particularly gannets, however, are found in temperate regions too. These birds are not truly pelagic seabirds and usually stay rather close to the coasts. All species feed entirely at sea, mostly on mid-sized fish and similarly-sized marine invertebrates. Many species feed communally, and some species follow fishing boats to scavenge discarded bycatch and chum. The typical hunting behavior is a dive from mid-air, taking the bird a meter or two under water. If prey manages to escape the diving birds at first, they may give chase using their legs and wings for underwater swimming.