There are five species of rhinoceros in the world and all are endangered, Just as there are more than one eagle at risk of extinction.   So they are depicted here again on a different part of the tree.   An artist, treatments such as the way the eagle's wing drapes across the rhino's forehead and muzzle impress the daylights out of me.

More reading about birds of prey can be found at Raptor Education Foundation and the rhino at the World Wildlife Fund.