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This classification is based on such morphological features as the number of vertebrae, the structure of the pectoral girdle, and the morphology of tadpoles.While this classification is largely accepted, relationships among families of frogs are still debated.A frog is any member of a diverse and largely carnivorous group of short-bodied, tailless amphibians composing the order Anura (literally without tail in Ancient Greek).The oldest fossil "proto-frog" appeared in the early Triassic of Madagascar, but molecular clock dating suggests their origins may extend further back to the Permian, 265 million years ago.From a classification perspective, all members of the order Anura are frogs, but only members of the family Bufonidae are considered "true toads".
There are over 6,300 recorded species, accounting for around 88% of extant amphibian species.
More than one third of species are considered to be threatened with extinction and over 120 are believed to have become extinct since the 1980s.
The number of malformations among frogs is on the rise and an emerging fungal disease, chytridiomycosis, has spread around the world.
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.
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