David Haskell did some research on how chickadees survive in such a cold climate. He decided to take all his clothes off in the same climate that the chickadees live in, to see how long he would survive. He figured that is a small bird could do it then so could he. He thought this because he has a larger volume, more fat on his body and the fact that people consume lots of calories and so should produce more heat. He soon realised that because of his large volume he had a larger surface area and so lost more heat. That the birds are insulated with feathers. That the birds had muscles to shiver that are far greater than ours, making more heat and that the chickadees flock with other birds for safety.
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