Brown Booby

Sula leucogaster
Brown booby

Adults are chocolate brown with white underwing coverts and belly. Sexes are distinguishable by face, bill, and leg color. These parts are yellow in females and are grayish green in males, which in addition, have a bluish throat. Juveniles have plumage similar to adults except that belly and under wing covert color is light brown.

Nests are located on the ground and consist of a shallow depression surrounded by twigs or other vegetation. A female will typically lay an average of two chalky white eggs are laid. Brown boobies lack a brood patch and instead incubate with their feet. Parents share incubation duties and the average incubation shift is 12 hours, with an average incubation period of 43 days at other colonies where they have been studied. The first egg hatches several days before the second and the first chick to hatch often ejects the second chick from the nest shortly after it emerges from the egg. Studies elsewhere have shown that chick feeding occurs on average once every 17 hours. Fledging occurs 85-103 days after hatching. Post-fledging care and feeding continues for one to two months.

Facts About Brown Booby

Squid and fish, especially flying fish. 
Life Span
16 years 
Length: 64-85 cm (25.2.6-33.5 in); wingspan: 132-155 cm (52-61 in)