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Frogs, Toads and Salamanders
Amphibians are ectothermic, tetrapod vertebrate animals of the class Amphibia. Though they inhabit a wide variety of habitats, most species live within terrestrial, fossorial, arboreal or freshwater aquatic ecosystems. With their complicated reproductive needs and permeable skins, amphibians are often ecological indicators. In other words, when an ecosystem is under stress, these animals die off first. This is a problem. Because in the recent decades, their populations have decreased around the globe.
There are approximately 7,000 species of amphibians, of which nearly 90% are frogs. The smallest in the world is a frog from New Guinea (Paedophryne amauensis) with a length of just 7.7 mm (0.30 in). Meanwhile, the largest is the 1.8 m (5 ft 11 in) Chinese giant salamander (Andrias davidianus). However, even that is dwarfed by the extinct 9 m (30 ft) Prionosuchus from the Permian of Brazil.