Abstract
FOR some years past certain ornithologists have directed attention to the decreasing number of swallows seen in the British Isles during the i months from April to September. This diminution was particularly marked in 1918 and 1919, j less so in 1920, but is still more apparent in the present year. For a time the scarcity was enied b y many, or stated to be only of local occurrence, I but the condition of affairs during the present season is sufficiently well marked to convince the '. most sceptical.
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COLLINGE, W. The Scarcity of Swallows. Nature 107, 628 (1921). https://doi.org/10.1038/107628a0
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DOI: https://doi.org/10.1038/107628a0