Further to the right birds are hidden beneath the snow. These birds are black grouse and ptarmigan.
Olaus reports that these birds gorge themselves on the fruits of birch trees, and then "The flocks divide and the birds plunge into the middle of snowdrifts, particularly in January, February, and March, when the heaviest snows descend from the clouds in tornadoes, typhoons, and tempests. . . . After they have enveloped themselves and are packed together deep down so that none is visible, then in certain weeks of the year they discharge the food that has been gathered in their crops and eat it once more to keep themselves alive" (Magnus 1998, III:985).
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