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wood frog
The wood frog (''Rana sylvatica'')〔〔〔 has a broad distribution over North America, extending from the southern Appalachians to the boreal forest with several notable disjunct populations including lowland eastern North Carolina. The wood frog has garnered attention by biologists over the last century because of its freeze tolerance, relatively great degree of terrestrialism (for a ranid), interesting habitat associations (peat bogs, vernal pools, uplands), and relatively long-range movements. The ecology and conservation of the wood frog has attracted research attention in recent years because they are often considered "obligate" breeders in ephemeral wetlands (sometimes called "vernal pools") that are themselves more imperiled than the species that breed in them. The wood frog has been proposed to be the official state amphibian of New York.
==Description==
Wood frogs range from in length. Females are larger than males.〔〔 Adult wood frogs are usually brown, tan, or rust-colored, and usually have a dark eye mask.〔 Individual frogs are capable of varying their color; Conant (1958) depicts one individual when light brown and dark brown at different times. The underparts of wood frogs are pale with a yellow or green cast.〔
A small brown frog with a dark eye mask in the woods is likely to be a wood frog.No other species has a similar appearance to the wood frog in North America. The first evasive leap is fast and long. Close observation will often glimpse a second short dive under the leaf litter, making the frog seem to disappear.
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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