Blue-footed Booby

Overview

The Blue-footed Booby is a tropical seabird of the eastern Pacific, widely recognized for its bright blue feet used in courtship display, though its plumage is also distinctive in its own right, with a brown mottled back and wings, a streaked brown-and-white head, and clean white underparts.

It nests in colonies on rocky and sandy islands, including well-known populations in the Galápagos, and is a strong plunge-diver that often forages in coordinated groups.

Blue-footed Booby feathers show a mottled brown-and-white pattern rather than the sharply divided tones of some other boobies.

• Upperparts: Brown feathers with pale mottling or scaling, giving a somewhat textured look rather than a solid, uniform brown.
• Head and neck: Fine brown streaking over a paler base, distinct from the sharp dark hood of the Brown Booby.
• Underparts: Clean white belly and underwing coverts.
• In flight: A pale, whitish patch on the upper back/rump area is visible between the wings, forming a rough M-shape pattern across the back when the wings are spread.
• Compared to Brown Booby: Blue-footed Booby lacks the sharp, clean demarcation line across the breast seen in Brown Booby, instead showing more gradual streaking and mottling.

Adults show brown, scaly-mottled upperparts, a finely streaked brown-and-white head and neck, and white underparts and underwing linings, with a pale patch visible on the back in flight. Sexes look similar, though there can be subtle differences in eye pupil size used in behavioral studies rather than plumage. Juveniles are more uniformly brownish with less defined head streaking, gradually acquiring the adult pattern over a couple of years.

Blue-footed Boobies breed on rocky and sandy islands along the Pacific coast from the Gulf of California south to Peru, with a well-known population in the Galápagos Islands. They forage over nearshore and offshore tropical and subtropical waters, generally remaining within relatively short distances of their breeding colonies year-round.

This booby feeds by plunge-diving from moderate heights, often foraging in coordinated groups that follow schools of small fish close to the surface. Nesting occurs on bare ground in colonies, with elaborate foot-based courtship displays preceding egg-laying, and typically two eggs are laid with siblicide sometimes reducing brood size under poor conditions. Calls differ between the sexes, with males giving thin whistles and females giving harsher honking notes.