Horrifying Familial Bonds. Crypt spiders usually gather in mated pairs with a larger female dominating a smaller male.&nbsp;In desperate times, males become food for crypt-spider young.&nbsp;Once mated, the female lays her eggs in the bodies of their prey, where the brood mature by feeding on the creatures' fluids and each other. Those that survive into adulthood "hatch" from the corpse in a horrifying display.