Amphibians include frogs, toads, newts, salamanders, and caecilians. They depend on the sun for warmth because they are ectothermic. Ectothermic means that they are not able to regulate their body temperature! Amphibians start their life cycle in water. They hatch from eggs, like birds and swim underwater with gills. Then, over time, they start growing lungs and start to move on land! They go through a change called metamorphosis, which means that they start at one different stage and end at a completely different stage! The word amphibian in Greek actually means “both forms of life” because they live in both land and water!