Ovoviviparity is employed by many aquatic life forms; such as, fish and some sharks, reptiles, and invertebrates.
The young of ovoviviparous amphibians are sometimes born as larvae, and undergo metamorphosis; a biological process by which an animal physically develops after birth or hatching outside the body of the mother.
The young receive nourishment only from the yolk. Hatching is internal, and the young are then released to the outside. Some insects, sharks, fish, snakes, and lizards are ovoviparous.