Because of their slow metabolism and heat-seeking behavior, reptiles are cold-blooded. Reptile reproduction also depends on temperature. Only boas and pythons give birth to live young. The other ...

This process is known as metamorphosis. Like reptiles, amphibians are cold-blooded. Because of their special skin, they require very specific living conditions. Too much sun can damage their cells.

But as they get older, they change so they can live on land. These creatures are called amphibians. Frogs are amphibians. In the spring, female frogs lay thousands of eggs in pools or streams.