(Latin: egg)

Animals that develop within eggs and which remain within the mother's body up until they hatch or are about to hatch.
The process whereby eggs are produced that stay inside the maternal body for incubation and development and hatch just before, or following, extrusion. This is common among many reptiles.
The production of fully formed eggs that are retained, and hatched, inside the maternal body with the release of live offspring.

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.

Characterized by the production of large, yolky, shell-protected eggs that are retained and develop within the reproductive tract of the female.

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.