In search of food from the tips of the branches, the little finger makes a bird flight. Photo: Rein Kuresoo Photo: Rein Kuresoo Read the summary In general, throughout the winter in our forests, there are bird flocks consisting of various species of birds. These groups are kept together by calls: the whistles of different species of thrushes, the rustle of the sparrows, the whistles of the sparrows and the whistles of the little finger, writes biologist Rein Kuresoo.

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