The word amphibian means two-lives Amphibians spend their lives in the water and on land
Amphibians are cold-blooded, which means that they are the same temperature as the air or water around them.There are more than 4,000 different kinds of amphibians. Members of this animal class are frogs, toads, salamanders, newts, and caecilians or blindworms. All amphibians begin their life in water with gills and tails. As they grow, they develop lungs and legs for their life on land.
Amphibians evolved from fish about 400 million years ago, when the amount of dry land on Earth increased greatly .Certain fish adapted to these changing conditions by gradually developing limbs to crawl with and lungs to breathe with.The young generally undergometamorphosis from larva with gills to an adult air-breathing form with lungs. Amphibians use their skin as a secondary respiratory surface and some small terrestrial salamanders and frogs lack lungs and rely entirely on their skin.
Animals that are apart of the amphibian class are frogs, toads, salamanders, newt, and caecilians, there orders are Anura, Caudata, and Apoda.Amphibians are presented in 3 subclasses Ichthyostega, Lepospondyli, and Lissamphibia.
The characteristics of an amphibian such as a Newts are cold blooded. Newts are carnivores and they like to feed on the spineless and smaller animals that roam around with it. The newt itself goes under a process call metamorphosis. this is where the newt actually becomes an amphibian by getting the ability live on both land and water. Newts can also be sometimes toxic to its predators in order to protect itself.