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Rana (genus)
''Rana'' (commonly known as the pond frog or brown frog) is a genus of frogs. Members of this genus are found through much of Eurasia, North America, Africa, Central America, and the northern half of South America. Many other genera were formerly included here;〔Cai ''et al.'' (2007), Stuart (2008)〕 see below for details.
These true frogs are usually largish species characterized by their slim waists and wrinkled skin; many have thin ridges running along their backs but they generally lack "warts" like in typical toads. They are excellent jumpers due to their long slender legs. The typical webbing found on their hind feet allows for easy movement through water. Coloration is mostly greens and browns above, with darker and yellowish spots.
==Distribution and habitat==
Many frogs in this genus breed in early spring, although subtropical and tropical species may breed throughout the year. Males of most of the species are known to call, but a few species are thought to be voiceless. Females lay eggs in rafts or large, globular clusters, and can produce up to 20,000 at one time.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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