Brown Booby
NameBrown Booby
Common NameBrown Booby
Scientific NameSula leucogaster
FamilySulidae
Wingspan (cm)143
Length (cm)69
Weight (g)1100
Plumage DetailsAdults display a striking plumage pattern with dark brown head, neck, back, and upperwings, sharply contrasting with a pure white belly and underwing coverts. Males typically have a blue base to their bill and blue facial skin, while females possess a yellowish bill and facial skin. Juveniles are duller brown overall.
Vocalization / CallGenerally silent when at sea, Brown Boobies become vocal at their nesting colonies. Their repertoire includes harsh grunts, whistles, and hisses. Males often produce a high-pitched whistle, whereas females emit a distinctive harsh 'kraaaah' or 'rraah' call.
Primary Dietpiscivore
Primary Habitatscoastal
Conservation Statusleast-concern
Geographic RangeThe Brown Booby has a widespread distribution across tropical and subtropical oceans globally, including the Atlantic, Pacific, and Indian Oceans. They breed on islands and coastal cliffs throughout their extensive range.
Identifying Featuresdark brown upperparts, white belly, pointed bill, sexual dimorphism in bill/facial color (males blue, females yellow), plunge-diving behavior
Description
The Brown Booby is a medium-sized seabird characterized by its dark brown upperparts and contrasting white belly. These agile birds are expert plunge-divers, feeding on fish and squid in tropical and subtropical waters.
