The Brown Booby - Sula leucogaster - has a sleek, streamlined body with brown and white plumage; there is a sharp demarcation line between brown head and chest and white underside; tail is brown. Bill is pale brown or all yellow in females, pale brown or yellow with blue at the base in males.
Males reach 65 to 75 centimetres long with 1.3 to 1.5 metre wingspan; females are slightly larger and may have brighter coloured feet.
The brown booby dives for fish from up to 15 metres in the air and may reach just below the surface, or to as deep as 2 metres. Tail feathers spread during the dive to help control the diving speed and wings are folded just before water impact. At sea, commonly feeds in areas where large predatory fish such as tuna drive smaller fish to the surface; also follows fishing vessels.
Pelagic bird with worldwide tropical range. Common around the north coast of Australia from North West Cape in Western Australia to south-east Queensland with some sightings on the New South Wales coast.
Only comes ashore to breed on islands off north-western Australia and on the Barrier Reef. Builds a ground nest of branches, bones, grass, human-generated trash, or other items. Placed on flat ground, usually in full sunshine. Nests in colonies. Clutch is usually one or two pale bluish or greenish eggs with a white outer layer.