Amphibians are cold-blooded. There are more than 4,000 amphibians around the world.
The amphibian classes are frogs, toads, salamanders, newts and caecilians or blindworms.
All amphibians have backbones
Modern amphibians are all lissamphibia.
The word amphibian means two lives. Amphibians spend their lives in water and land. All amphibians begin their life in water with gills and tails. As they grow, they develop lungs and legs for their life on land.