Cutaneous respiration
The skin of amphibians is a major site of respiration in all species for which measurements are available. Cutaneous respiration is the sole respiratory mode of lungless salamanders (family Plethodontidae) which lack lungs entirely yet constitute the largest family of salamanders. Cutaneous respiration in frogs and other amphibians may be the primary respiratory mode during colder temperatures.
African dwarf frog
African dwarf frogs live their entire lives underwater but need to rise to the surface to breathe air because they have lungs and not gills. These frogs are small in size and do not weigh more than a few grams. They vary in color, mostly ranging from olive green to brown with black spots. The average life expectancy of these frogs is five years, but they can live as long as 20 years, and they can grow to 3 inches (7.5 cm) long. When young, African dwarf frogs can be mistaken for and sold as African clawed frogs, of the genus "Xenopus", which are larger and more aggressive than the dwarf.