Although they resemble a mammal-reptile cross, the vorcha have no terrestrial analogue. They are humanoid in form, but vorcha have "clusters" of nondifferentiated neoblast cells, like those of Earth's planarian worms. Damaged vorcha cells mature into specialized structures to alleviate injury or stress. Transformations include thicker skin following injury, lung adaptation for barely breathable atmospheres, and stronger cardio-skeletal muscle under high gravity. Skull capacity and brain size do not change, and vorcha rarely make more than one somatic overhaul.