Mud puppies are an unusual type of salamander. Like most adult amphibians, mud puppies have lungs. But unlike most mature amphibians, they also have gills to breathe underwater.
The red-spotted newt lives in ponds and streams in the eastern and central United States. In its larval stage, shown here, its skin is a bright reddish-orange. After reaching adulthood, its skin turns olive with red spots.
Poison Arrow Frog
Amphibians have amazing skin. Amphibians can drink water and also breathe through their skin. The skin of some amphibians, such as this poison arrow frog, contains poisons that help keep predators from eating the amphibian.
These brightly colored toads were once found in the Central American country of Costa Rica. Today, they have disappeared. Scientists believe they became extinct because of pollution and warmer temperatures.