Abstract
I HAVE thought that this habit can be explained as follows; at least as regards rooks, which I have often noticed soaring in flocks, especially in the spring, and I think usually in warm cloudy weather.
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FISHER, O. On the Soaring of Birds. Nature 42, 457 (1890). https://doi.org/10.1038/042457a0
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DOI: https://doi.org/10.1038/042457a0
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