sea cow manatee Manatees (family *Trichechidae*, genus *Trichechus*) are large, fully aquatic, mostly herbivorous marine mammals sometimes known as sea cows. There are three accepted living species of *Trichechidae*, representing three of the four living species in the order Sirenia: the Amazonian manatee (*Trichechus inunguis*), the West Indian manatee (*Trichechus manatus*), and the West African manatee (*Trichechus senegalensis*). [https://en.wikipedia.org/wiki/Manatee] trichechidae trichechus requires discussion