What are amphibians?

Amphibians can breathe with lungs if on land or through their skin when underwater. They are ectothermic vertebrates that use sunlight to become warm and active. Most go through metamorphosis from a larval stage (like tadpoles) to an adult. 90% of amphibians return to the water to mate and lay eggs whereas 10% will lay their eggs in humid environments or even carry their young internally until they hatch.