The mud-spike has replaced its ancestor. The evolution of the eelsaur and now the serpentsaur has sparked an arms race in evolution between the two species. The mud-spike has become smaller again, to further enable it to escape its predator. It has also evolved the ability to fold all its limbs against its body to maximize its streamlined shape. Its tail has grown bigger for more power and it has evolved a sharp spine on the top of its fin. As a last line of defense against the serpentsaur, it will use its retractable fin to repeatedly stab the roof of the serpentsaur’s mouth. This, if the mud-spike is lucky, will cause the predator to gag and give the mud-spike another chance of escape. It has also changed color for improved camouflage.