Frogs are amphibians in the Order Anura, which includes
frogs and toads. The term "frog" is a popular
nomer for animals that look like toads, but are generally
more slender, have a less warty and dry skin, have long
legs adapted for leaping and are more aquatic. It has
no meaning in animal systematics, since many anuran families
include both "frogs" and "toads".
The true frogs are the Ranidae and the true toads are
the Bufonidae. Frogs range in size from less than 50mm
(2.0 in) to 300mm (11.8 in) in Conraua goliath, the Goliath
frog from Cameroon, which is the largest known frog. Frogs
can have horizontal pupils, like tree frogs and true frogs,
or vertical pupils, like the painted frogs. The skin is
smooth, unkeratinized and hangs loosely on the body because
of the lack of loose connective tissue.
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