It seems to work though. Quite well too for most animals, though I understand giving birth is even more hazardous for the female hyena than for the female human.
Once, I saw two tiny insects busy making more insects. They were on a rock the size of a house-brick, just above the surface of a shallow, rushing river about twenty feet wide, in a cave.
How did they manage even to find each other in a small population of their own kind (probably the fungus-gnat), and their little island, in total darkness, in a noisy, draughty and very large passage?