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.