Birds are warm-blooded animals. Birds breathe in air through their lungs. Fish Fish live in water all the time. A fish uses its tail and fins to swim. They have scales covering their bodies to help protect them.
All fish have gills, which they use to breathe.
Most fish are born from eggs. Fish are cold-blooded animals. Amphibians Amphibians live some of the time in water and some of the time on land. They have wet, smooth skin. Amphibians lay eggs in water.