Amphibian Facts

1. Most amphibians are toads and frogs.

2. There are between 5,000 and 6,000 species of known amphibians.

3. Amphibians have delicate, permeable skin.

4. The largest amphibian is the Chinese giant salamander.

5. Amphibians were the first four-limbed vertebrates.

Amphibians are so reliant on water because even after they are able to move onto land, they have water-permeable skin that requires water in order to keep them living. Therefore, they cannot venture far from the water. Amphibians are an important consideration when assessing water quality because an amphibian's interactions with the water can provide clues on the condition of the water (such as whether it is polluted or clean).