Manatees, also known as sea cows, are large, aquatic and mostly herbivorous marine mammals.

Gigantism is an evolutionary survival strategy, especially for herbivorous animals, because size is a form of defense against predators," Apaldetti said.

Scavenging is both a carnivorous and herbivorous feeding behavior in which the scavenger feeds on dead and decaying organic matter present in its habitat.

The hippopotamus is a semiaquatic, mostly herbivorous mammal.