Wood Frogs Freeze and Thaw in Alaska


Did you know that frogs hibernate? In fact, they freeze themselves in the winter and, when summer rolls around again, they thaw.

The wood frog lives in Canada and Alaska, where the coldest recorded temperature is -80 degrees Fahrenheit. The northern wood frog in Alaska spends seven months frozen each year—though “frozen” is kind of a misnomer. This animal actually does not fully freeze while hibernating; only two-thirds of its body fluids turn to ice.

Researchers discovered that the frogs do not stay frozen until they spend a week or two freezing at night and thawing during the day in sub-zero temperatures. The frogs are very delicate when they are frozen; if dropped, twisted, or bent while in this state, they can easily break.

When the frog is frozen while hibernating, its frozen blood does not flow. Essentially, this means that the frog is dead. The frog’s cells are still functioning, but they have no connection with the frog.

Frogs are amazing creatures. Not only can they jump extremely high, but they can also freeze and un-freeze themselves. These shocking and interesting facts make frogs fascinating.

[Sources: www.nps.gov;www.latimes.com]

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