Oviparous animal, << oh VIHP uhr uhs, >> is an animal that reproduces by means of fertilized eggs that develop outside of the mother’s body. In viviparous animals, eggs are fertilized and develop inside the parent. Most vertebrates (animals with backbones) are oviparous, although there are exceptions. For example, certain types of fish, sharks, lizards, and snakes, and all mammals except for the platypus and the echidna, are viviparous.