Board Thread:New on Galactic Crucibles/@comment-5135903-20141008164704/@comment-5870856-20141112204110

Well, think about it - during the entirety of it's development, the Khoikapek is almost completely exposed to the elements, at least compared to egg-laying animals and placentals on Earth. All it would take is a small predator which could dart underneath the mother and grab up one of the worm-like juveniles, or some kind of flood to wash away the fluid on their chest, and the Khoikapek is dead. A similar problem exists with marsupials, who have little besides their pouches to protect their children. There's a reason why placentals are one of the most successful mammal groups - indeed, groups, period - in the world and marsupials are more or less extinct everywhere but Australia.