Friday, 19 October 2018

Bad News (Woolly) Bears

This little woolly bear is out and about looking for a cozy place in the leaf debris to overwinter.
According to folklore, its smaller than usual brown band is an omen of a harsh winter ahead, which I suppose is only bad news if you're not a skier. The caterpillar itself doesn't mind how cold and snowy it gets. It is one of the very few animals that can survive being frozen solid all winter long.
Woolly Bear can survive freezing over the winter
Woolly Bear looking for a good place to freeze
Generally freezing destroys living tissue as the water in the cells crystallizes, but woolly bears produce a natural antifreeze that prevents the insides of their cells from freezing. They can survive temperatures as low as -67°C (-90°F).
In the spring it will dine on fresh green grass and spin a cocoon for its transformation into an isabella tiger moth, losing its ability to survive freezing temperatures along the way.
Thanks to the University of Nebraska for teaching us about woolly bears.
https://lancaster.unl.edu/feature/guess10_3.htm

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