Amphibians have a backbone. They are vertebrates.
Amphibians are cold-blooded. They cannot regulate their own body temperature.
Amphibians spend at least part of their lives in water and on land.
Amphibians do not have scales and their skin is permeable (molecules and gases can pass through).
Amphibians have gills for at least part of their lives. Some species have gills only as larvae, while others can have gills throughout their lives.
Most amphibians go through metamorphosis
