Amphibians include around 4,000 species of cold-blooded vertebrates, like frogs, toads, and salamanders, that are closely associated with freshwater and moist places. Because they can be loud and relatively easy to catch, they are sometimes used by a few cultures.
Amphibians are cold-blooded vertebrates – around 4,000 species worldwide – comprised mostly of frogs and toads, but also salamanders. Amphibians all have a smooth and wet skin. Most develop in water with external gills then change into lung-breathing adults that remain associated with freshwater and moist places.