What is the term for animals whose embryos develop inside eggs that remain in the mother's body?

The term for animals whose embryos develop inside eggs that remain in the mother's body is "ovoviviparous." In ovoviviparous species, the eggs are retained within the mother's body until they are ready to hatch, allowing the embryos to develop in a more protected environment while still relying on the nutrients stored within the egg. This reproductive strategy combines aspects of both oviparity (where eggs are laid outside the body) and viviparity (where live young are born), making it a unique adaptation among various animal groups, such as some species of snakes and sharks.

In contrast, oviparous animals lay their eggs outside and do not provide further development within the body, while viviparous animals supply nutrients directly to the developing embryos through a placental or similar structure, resulting in live births. The term "carnivorous" relates to an animal's diet rather than its reproductive strategy, and does not apply in this context.