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Crocodiles | Snakes | Turtles | Lizards | Tuatara |
| Reptiles are either oviparous or viviparous in their mode of reproduction |
| Oviparous(egg laying): Oviparous reptiles lay amniotic eggs. Amniotic eggs have a hard shell which protects the embryo, and a special membrane to prevent the embryo from drying out. Turtles, crocodiles, and tuatara are all oviparous as are some species of lizard and snake. |
 Crocodile egg |
 Preserved life cycle of a viviparous lizard (Lacerta vivipara) |
Viviparous (live bearing): Viviparous reptiles give birth to live young. Some snake and lizard species are viviparous |