Amphibian fossils include frogs, toads, and the forebearers of salamanders and newts. They were cold blooded animals that metamorphosed from water breathing juveniles into air breathing adults.
Amphibians laid eggs in water, but were superficially similar to reptiles.
They evolved originally in the Devonian Period, and were top predators in the Carboniferous and Permian, but many lineages died out in the Permian/Triassic extinction.