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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.
They have highly specialized rasping mouth parts suitable for herbivorous, omnivorous or planktivorous diets.
The skins of frogs are glandular, with secretions ranging from distasteful to toxic.
Warty species of frog tend to be called toads but the distinction between frogs and toads is based on informal naming conventions concentrating on the warts rather than taxonomy or evolutionary history.
There are approximately 4,800 recorded species, accounting for over 85% of extant amphibian species.
Frogs are widely distributed, ranging from the tropics to subarctic regions, but the greatest concentration of species diversity is in tropical rainforests.
Adult frogs generally have a carnivorous diet consisting of small invertebrates, but omnivorous species exist and a few feed on fruit.
Frogs are extremely efficient at converting what they eat into body mass.
Frogs produce a wide range of vocalizations, particularly in their breeding season, and exhibit many different kinds of complex behaviours to attract mates, to fend off predators and to generally survive.
Frogs are valued as food by humans and also have many cultural roles in literature, symbolism and religion.