 Reproduction is a special kind of viviparity, called placental viviparity, where the shark carries its live young in a placenta-like structure, complete with umbilical cord.The structure is derived from the wall of the embryonic yolk sac that has fused with the uterine wall.The snaggletooth shark preys on a variety of different animals, including bony fish, other sharks, rays, crabs, and cephalopods.