How can you explain that some species of birds (black grouse, capercaillie, hazel grouse, partridge, etc.) burrow into snowdrifts

How can you explain that some species of birds (black grouse, capercaillie, hazel grouse, partridge, etc.) burrow into snowdrifts and sometimes spend several days there?

Snow is a poor conductor of heat, so the snow cover during severe frosts and snowstorms protects birds from freezing.

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