A booby is a seabird in the genus Sula, part of the family Sulidae. Boobies are closely related to the ( Morus), which were formerly included in Sula.
The English name booby may derive from the Spanish language slang term bobo, meaning "stupid", as these tame birds had a habit of landing on board sailing ships, where they were easily captured and eaten. Owing to this, boobies are often mentioned as having been caught and eaten by shipwrecked sailors, including William Bligh of the HMS Bounty and his adherents during their voyage after being set adrift by Fletcher Christian and his followers.
Six of the ten extant Sulidae species called boobies are in the genus Sula, while the three gannet species are usually placed in the genus Gannet. Abbott's booby was formerly included in Sula but is now placed in a monotypic genus Papasula, which represents an ancient lineage perhaps closer to Morus. Some authorities consider that all ten species should be considered in Sula. However, they are readily distinguished by means of osteology. The distinct lineages of gannets and boobies are known to have existed in such form, since at least the Middle Miocene ().
The fossil record of boobies is not as well documented as that of Gannet, either because booby speciation was lower from the late Miocene to the Pliocene (when gannet diversity was at its highest), or because the booby fossil species record is as yet incomplete due to most localities being equatorial or in the Southern Hemisphere.
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