Amphibians are small vertebrates that need ... At a certain size, the young develop limbs and lungs. Some also lose their tails. Eventually, they hop or climb out of the water as adults, and ...

Without these features, a terrestrial vertebrate cannot stand. Lungs and a pulmonary circulation replace gills.; no gill cover necessary. Lungs of early amphibian were not very different from those of ...

Amphibians lay eggs in water like this frogspawn. The wriggling tadpoles hatch with tails and gills to breathe underwater just like fish. As they grow, they develop legs and lungs and begin to ...

Legend has it the axolotl was not always an amphibian. Long before it became Mexico’s most beloved salamander and efforts to ...

Reptiles are turtles, snakes, lizards, alligators and crocodiles. Unlike amphibians, reptiles breathe only through their lungs and have dry, scaly skin that prevents them from drying out. Amphibians ...