amphibians                                  

the amphibians are vertebrates  like  birds , fish , reptiles and mammals  ,  the caracteristics are   they live in the water  or in the land ,  they have four legs  ,  cold blooded  , they haven´t have hair in the body  they have bare skin  and without scales . they can be  Green , Brown red , orange ..... . amphibians means amphi double  and  bians life. the most amphibians are small  than  frogs , tritonos , toads ..... . the reproduction they reproduce by eggs , they are oviparous  ,  the frogs reproduce with fertilización and they can`t reproduce in the water  . the  feed  are insects , fly , worms , slug  .... and some times amphibians are carnivores , herbivores or omnivores , depends of the species .they exist  species  that are very , very bigs   for example    a frog  ..... .  the parts are  the  head  , the legs , the eyes ,  the mouth ,  the cráneo , the fémur , the hart  , the  tongue , the brain , the lungs  , the backbone , the stomach , páncreas ..... .most people are familiar with frogs , toads , news , and salamandres  . there about 5.500 know amphibian species . many adult amphibians  have producing glands in thei skin. the amphibians were the first vertebrates who tried to survive on the land .