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3. Denali
One of the most popular National Parks in Alaska, Denali has an interesting resident. One species of wood frog freezes completely solid during winter. Its hearts even stops beating!
Come spring, the wood frog thaws, its heart warms and starts pumping again, and off it hops!
This little guy really does turn into a popsicle come winter.
Dan Young at the National Park Service writes,
Scientists have found that core organs, such as the heart and liver, freeze last and thaw first. That means vital body functions such as circulation and metabolism are maintained for the longest possible time. Once the temperatures rise in spring, the frogs thaw and they are off in search of ponds for breeding.
