Post 01620
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The cheerful water-ouzel, even during the winter, obtains much of its food from the bottom of brooks and lakes. The ouzel spends many winter nights in nooks and niches in the bank between the ice and the water. This is a strange place, though one comparatively safe and sheltered. In getting into the water beneath the ice, the ouzel commonly finds opportunity at the outlet or the inlet of the lake; sometimes through an opening maintained by spring water. There are usually many entrances into the waters of a frozen brook,–openings by cascades and the holes that commonly remain in the ice over swift waters. Excessive snow or extreme cold may close all entrances and thus exclude the ouzel from both food and water. Down the mountain or southward the ouzel then goes.
Woodpeckers and chickadees fare well despite any combination of extreme cold or deep snow. For the most part their food is the larvæ or the eggs that are deposited here and there in the tree by hundreds of kinds of insects and parasites which afflict trees. Nothing except a heavy sleet appears to make these food-deposits inaccessible.
Most birds spend the winter months in the South. But bad conditions may cause resident birds and animals to migrate, even in midwinter. Extremely unfavorable winters in British Columbia will cause many birds that regularly winter in that country to travel one or two thousand miles southward into the mountains of Colorado. Among the species which thus modify their habits are the red crossbill, the redpoll, the Lapland longspur, and the snowy owl.