The Red-footed Booby, Sula sula, is a large seabird of the gannet family, Sulidae. They are powerful and agile fliers, but they are clumsy in takeoffs and landings.
The Red-footed Booby is the smallest of all boobies at 71 cm in length and with a 137 cm wingspan. It has red legs, and its bill and throat pouch are coloured pink and blue. This species has two plumage forms. The white phase is mostly white with black on the flight feathers. The brown form is brown with a white belly, rump, and tail. Both forms may occur sympatrically, as in the breeding colony on St. Giles Island, Tobago.
The sexes are similar, and young birds are greyish with browner wings and pink legs found in tropical islands.