How wild birds keep from freezing in winter

We had bird visitors at the feeder when it snowed in December. They disappeared when it rained and the ground was bare. We missed the little buddies: “Boss” Dee and two companions, juncos, Mr. and Mrs. Cardinal, nuthatch and tufted titmouse. And a scattering of little sparrows, a woodpecker and mourning doves. One day only, a bluebird showed up.

What do birds do when it’s very cold? 

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