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An amphibian is a member of the family Amphibia (which means double life). They are characterized by the ability to live on land and in the water. This family includes newts, frogs, toads, and salamanders..they are cold-blooded (ectothermic) vertebrates with four legs. They have eggs that are not amniotic, so they have to lay their eggs in water. Although most species eventually live on the land, many species do not stay on land, such as the salamander which requires wet/moist skin to live. Reptiles are also cold-blooded but they lay amniotic eggs (aka the eggs have a shell that protects the embryo inside a fluid sac. They do not require a period of water-life but many can utilize water, such as sea snakes and other water-hunting animals like the alligator and crocodile. Both are closely related, the study of both families is referred to as Herpetology. There are some great general texts under that heading.
amphibians are able to walk on land and swim in water
reptiles cant
well one way is that amphibians are born in the water and then come onto land when they are older. Frog eggs-tadpole-adult and reptile eggs are laid on land.
amphibians start life in water and end it on land (they have gills when they hatch and develope lungs as they get older), reptiles live on land thier entire lives (they breath air through lungs, but a few species such as the marine iguana, and sea crate live in water but they still have lungs and will come on land) also amphibians are soft smooth skined, reptiles have rough scally skin.
MJ, that is not completly correct as there are iguanas that go into the water and swim to eat and there are see snakes that are still reptiles even though they spend there whole lives in water. Im sure this was an over site on your part though.
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