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Manatees (family Trichechidae, genus Trichechus) are large, fully-aquatic marine mammals sometimes known as sea cows. The name comes from the Spanish manatí, which itself comes from a Carib word meaning "breast." They comprise three of the four living species in the order Sirenia, the other being the dugong, which is native to the Eastern Hemisphere. The Sirenia is thought to have evolved from four legged land mammals over 60 million years ago, with the closest living relatives being the Proboscidea (elephants) and Hyracoidea (hyraxes).

Manatees (family Trichechidae, genus Trichechus) are large, fully-aquatic marine mammals sometimes known as sea [[cow]]s. The name comes from the Spanish manatí, which itself comes from a Carib word meaning "breast." They comprise three of the four living species in the order Sirenia, the other being the dugong, which is native to the Eastern Hemisphere.