Rana sylvatica, also known as the wood frog, possesses an extraordinary evolutionary adaptation to survive plummeting temperatures. During the winter, the amphibians freeze solid and appear to die - however, the following spring, they thaw out just like any other frozen object.
This unique trait is due to a solute in the frog’s blood called cryoprotectants, which acts in a similar manner to antifreeze by helping the frog’s body resist forming ice crystals inside of its cells.
Reference:https://www.nwf.org/Wildlife/Wildlife-Library/Amphibians-Reptiles-and-Fish/Wood-Frog.aspx
Photo credit: Svein Nordrumhttps://www.flickr.com/photos/nordrum/11053640906
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