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Frogs are valued as food by humans and also have many cultural roles in literature, symbolism and religion.

Frog populations have declined significantly since the 1950s.

Frogs' skins vary in colour from well-camouflaged dappled brown, grey and green to vivid patterns of bright red or yellow and black to advertise toxicity and warn off predators. The eggs hatch into aquatic larvae called tadpoles that have tails and internal gills.While this classification is largely accepted, relationships among families of frogs are still debated.The origins and evolutionary relationships between the three main groups of amphibians are hotly debated.A further study in 2011 using both extinct and living taxa sampled for morphological, as well as molecular data, came to the conclusion that Lissamphibia is monophyletic and that it should be nested within Lepospondyli rather than within Temnospondyli.The study postulated that Lissamphibia originated no earlier than the late Carboniferous, some 290 to 305 million years ago.

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