Amphibians are amimals that live the first half of their lives in water. Then when they mature they live on land and just come back to the water to reproduce. Amphibians are fairly smooth skin and live in mostly moist areas like the rain forrest or by a stream or pond. Some of these animals breath through gills, lungs, lining of the mouth, the skin, and or a combination of all of these things. And amphibians are cold-blooded invertebrates so they hibernate in the winter or they may freeze. Amphibians live in all continents except for Antarctica. And in only the continent of the United States there is over 230 different species of amphibians.