The Iums have an extraordinary anatomy, they have skeletons but their four limbs are boneless, instead of bones they have a sort of very supple cartilaginous tube surrounded by powerful muscles. They are amazingly strong. They have a peculiar digestive system, their energy source is a battery that they carry in their stomach cavity. It allows the Iums to survive without eating as they have no mouth or digestive system. The only thing they consume, apart from the air they breathe, is a little water through their nostrils from time to time. File:Ium-biology.jpg