What are amphibians? Amphibians are cold-blooded animals such as frogs, caecilians and salamanders.
They metamorphose from a water-breathing form, either to an air-breathing form or to a paedomorph that retains some of its juvenile characteristics.
Amphibians can be found in all three forms around the world. The map below details their density in each location.
Amphibian Facts
- Amphibians are divided into three groups which include newts and salamanders, frogs and toads, and caecilians.
- There are between 5,000 and 6,000 species of known amphibians alive today.
- The first amphibians appeared approximately 370 million years ago during the Devonian Period.
- Amphibians were the first four-limbed vertebrates.
- Amphibians have a simple body structure, when compared to other vertebrates.
- Amphibians have delicate, permeable skin.
- A group of salamanders known as the plethodontids have no lungs.
- Most amphibians have a life cycle that progresses through three stages.
- The largest amphibian is the Chinese giant salamander.
- Amphibians are declining around the world.
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