Amphibians

Amphibians are ectothermic, tetrapod vertebrates of the class Amphibia. They inhabit a wide variety of habitats, with most species living within terrestrial, fossorial, arboreal or freshwater aquatic ecosystems. Thus amphibians typically start out as larvae living in water, but some species have developed behavioral adaptations to bypass this.

The young generally undergo metamorphosis 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. They are superficially similar to lizards but, along with mammals and birds, reptiles are amniotes and do not require water bodies in which to breed. With their complex reproductive needs and permeable skins, amphibians are often ecological indicators; in recent decades there has been a dramatic decline in amphibian populations for many species around the globe.

The earliest known occurrence of Amphibians in the fossil record dates way back into the Devonian era from the sarcopterygian fish, but they later diversified in the Carboniferous and Permain periods.

In Eye of the Beastiary
Amphibians are rarely featured in Eye of the Beastiary, but when they are, they are considered deadly adversaries. They're mainly casted as the token animals of many of the swamp episodes such as  and .

Urodela

 * Bukavac