A fascinating life form. Visser three kept some as pets. I believe that the good Visser stated that he retrieved them from a dying planetary system, but i may be mistaken.
They are actually two species. The first creture is the body section. The second is the head, which is detachable and can fly.
The body section actually has wheels instead of feet, a remarkable phenomanon.
Both cretures can grow new Mortrons when cut in half, or smaller pieces, do to a rapid production of regenerative enzymes that are produced from glands that are stimulated by the cretures battle rage.