Most rhinoceroses prefer to avoid humans, but males, particularly during the breeding season, and females with calves may charge with little provocation. Despite their names, both of these animals are gray. Both have two horns growing from their snouts. The white rhinoceros ranks with the hippopotamus as the largest living land mammal next to the elephant. During the breeding season the males fight each other fiercely.
White rhinoceroses live on grassy plains in herds of about a dozen animals.
Black rhinoceroses are smaller than white rhinoceroses. Instead of grazing like the white rhinoceros, black rhinoceroses browse on trees and bushes. The other three species live in Asia. The two species of Asian one-horned rhinoceroses live in swampy jungles. The Javan rhinoceros is slightly smaller than the greater Indian species and can be distinguished by a continuous fold of skin across the middle of the back.