Sharks display three ways to bear their young, varying by species, oviparity, viviparity and ovoviviparity. There are two types of viviparity in fish. The offspring consume their mother from the inside in a process known as hemocelous viviparity. The species is oviparous, with one unverified claim of viviparity. The first two of these modes were categorized under histotroph viviparity, or aplacental viviparity. There are two types of viviparity among fish. Female aphids lay live young (nymphs), a process known as viviparity. Reproduction typically does not involve males (parthenogenesis) and results in live birth (viviparity). This type of reproduction is termed as adenotrophic viviparity. Around 20 percent of lizard species reproduce via viviparity (live birth). Viviparity in sharks can be placental or aplacental. Both oviparity and viviparity are found in Euselachii. As in viviparity, the young are born alive and fully functional. Therefore, they probably gave live-birth (viviparity) to their young like sea snakes.