One of the things that is most fascinating about sharks, is how remarkably varied their reproductive methods are. Shark reproduction is far more diverse compared to other animal groups - Despite being closely related, some sharks give birth to live young (known as "viviparity"), whilst others lay eggs ("oviparity"), where others hatch eggs internally, to then give birth to live young ("ovoviviparity"). Even when we talk about only oviparous sharks, there is still an incredible range of contrasti