wood frog

a typically light-brown frog, Rana sylvatica, inhabiting moist woodlands of eastern North America, having a dark, masklike marking on the head.


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Encyclopedia Britannica

wood frog

(Rana sylvatica), terrestrial frog (family Ranidae) of forest and woodlands. It is a cool-climate species, occurring from the northeastern quarter of the United States throughout most of Canada to central and southern Alaska.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The common wood frog displays a rare trait called freeze tolerance.
Once the first ice crystals reach a wood frog, however, its skin freezes.
When the perfectly camouflaged wood frog is sitting quietly among dead oak and
  maple leaves, it is nearly invisible.
Wood frog and salamander utilize fringes of some of the smaller wetlands.
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