Manatees eat cows on land.
A herbivore is an animal anatomically and physiologically adapted to eating plant material , for example foliage , for the main component of its diet . Manatees ( family Trichechidae , genus Trichechus ) are large , fully aquatic , mostly herbivorous marine mammals sometimes known as sea cows . Manatees are occasionally called sea cows , as they are slow plant-eaters , peaceful and similar to cows on land .