Summary:
- There are four living orders of reptiles:Squamata, which includes lizards, snakes, and amphisbaenids (or “worm-lizards”) Testudines, which including turtles and tortoises.
- Reptiles are tetrapods (four-legged) and ectothermic, meaning their internal temperature depends on the temperature of their environment.
- Most reptiles reproduce sexually, meaning there are two parents involved.
- Reptile eggs are surrounded by a protective shell, which may be either flexible or inflexible.