Brown Booby

Sula leucogaster

Order

SULIFORMES

Family

Booby and Gannets (Sulidae)

Code 4

BRBO

Code 6

SULLEU

ITIS

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ILLUSTRATION

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PHOTOS

CONSERVATION STATUS

Least Concern

The Brown Booby has a large range, with the breeding range estimated globally at 50,000 to 100,000 square kilometers. It is native to the Americas, Africa, Asia, Europe, and Australia. The bird prefers marine habitats that are neritic, oceanic, coastal, or supratidal. The global population is estimated at 200,000 individuals and does not show significant signs of decline that would put it near the thresholds for inclusion on the IUCN Red List. Because of these population trends, the evaluation status of the Brown Booby is Least Concern.

IBIRD EXPLORER GENERAL

PHOTO SHARING AND DISCUSSION

BIRD PHOTOGRAPHY

SUMMARY

Overview

Brown Booby: This large, gull-like seabird is mostly dark brown with white under wing coverts, belly and vent. It has a blue-gray bill and yellow legs and feet. To acquire food, it plunge dives from 30 to 50 feet. It feeds on parrot fish, flatfish, mullets and other fish. It has alternating strong rapid wing beats and glides. The sexes are similar.


Range and Habitat

Brown Booby: May be found worldwide in tropical seas; summer visitor to the Gulf coast and Caribbean Sea; may occur casually farther north along the Atlantic coast; occasionally seen in southern California’s Salton Sea; may also occur accidentally along Pacific coast. Pelagic, breeds on coastal islands.

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SONGS AND CALLS

Voice Text

Generally silent

INTERESTING FACTS

  • Although they are powerful and agile fliers, they are particularly clumsy in takeoffs and landings; they use strong winds and high perches to assist their takeoffs.
  • Brown Boobies were considered the most common booby at Midway Atoll in the 1930s. Today they are a rare sight. Rats, which have now been eradicated from Midway, are implicated in their decline. In late 1999, the first nest since 1963 was recorded.
  • Siblicide is exhibited by chicks. The first egg hatches several days before the second. The first chick to hatch ejects the second chick from the nest shortly after it emerges from the egg.
  • A group of boobies are collectively known as a "congress", "hatch", and "trap" of boobies.

SIMILAR BIRDS

RANGE MAP

CERange Map for Brown Booby

FAMILY DESCRIPTION

TERMINOLOGY

CREDITS

Author

Gary Owen Dick

Artist

Yury Lisyak

HELP ME IDENTIFY A BIRD

BACKYARD BIRDING

BIRDS AND BIRDING

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BellyX
The ventral part of the bird, or the area between the flanks on each side and the crissum and breast. Flight muscles are located between the belly and the breast.
VentX
Birds do not have two separate cavities for excrement and reproduction like humans do. In birds, there is one single entrance/exit that suits both functions called the vent, cloaca or anus.
Wing covertsX
The feathers that cover and protect the flight feathers.
PelagicX
The pelagic is a type of bird whose habitat is on the open ocean rather than in a coastal region or on inland bodies of water (lakes, rivers). An example of a pelagic bird is the blacklegged kittiwake.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X