Frogs are amphibians of the family Ranidae, in the Order Anura. They are closely related to toads. The Ranidae are sometimes called the "true frogs" since a few members of other families also have common names including the word "frog." Frogs are a diverse group with some 4800 species. Most spend their lives in or near a source of water (water frogs), although tree frogs live in moist environments that are not actually aquatic. The requirement for water becomes most acute for egg and tadpole stages of the frog, yet here again some species are able to utilize temporary pools and water collected in the axils of plants. The most familiar frogs are Common frogs, Bullfrogs, Edible frogs, Leopard frogs, Spring Peepers, Poison dart frogs, and Green Frogs.














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Some adult frogs are smaller than a person's thumb.Frogs range in size from less than 50mm (2.0 in) to 300mm (11.8 in) in Conraua goliath, which is the largest known frog. All frogs have horizontal pupils, smooth skin and long legs with webbing between their toes. This family has a bicornuated tongue that is attached in front: They also have a tympanum on each side of their head, which is involved in hearing. Most frogs have deep, booming calls, or croaks, with some being onomatopoeically represented by the sound (for English speakers), "ribbet" or "ribbit." The Ancient Greeks, via Aristophanes, transcribed the sound of a croaking frog as, "korax." Many species of frog secrete toxins from their skin. These toxins deter predatory animals from eating them, and some are extremely poisonous to humans. The natives of the Amazon area extract arrow-poison from the arrow-poison frog. Some toads also secrete toxins from their skins, the cane toad being a well known example.
001-013.jpg courtesy Us Fish and Wildlife Service
014-016.jpg courtesy: National Undersea Research Program
017-018.jpg courtesy: pdphoto.org




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