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Winter for birds means adapting, getting fat

...twigs that help reduce heat loss, or, in the case of chickadees, in tree cavities. At least some small birds save nocturnal energy by reducing their metabolic rate at night (a controlled hypothermia), and they generate some heat by shivering...

http://www.juneauempire.com/stories/012210/out_553295776.shtml
outdoors
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