The Surflarp (a bad excuse for a sidestep in evolution and the minor breed on the world of Sixten) solved it's problem with it's soft shelled eggs. Prior being the base of nutrition for a great deal of inhabitants now found it's protection inside the cranium of deceased humans. After the coming of man the species has greatly increased it's numbers. This will most likely be the case for some time to come until the natural recourses run out and mankind leaves a drained world alone to find treasures on a new one.