A mumak has an animal body. It has no hands. It has a thick hide. It is a herbivore.
... the Mumak of Harad was indeed a beast of vast bulk, and the like of him does not walk now in Middle-Earth; his kin that live still in latter days are but memories of his girth and majesty. On he came, ... his great legs like trees, enormous sail-like ears spread out, long snout upraised like a huge serpent about to strike, his small red eyes raging. His upturned hornlike tusks ... dripped with blood. The Two Towers, by J.R.R. Tolkien