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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Tags: Amphibians

This entry was posted on Wednesday, May 25th, 2011 at 10:44 am and is filed under Amphibians. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.