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his migration must have been an unusually large one. It has been suggested that the Glacial period had some connection with it, and there can be little doubt, as we shall see later on, that a change of climate probably brought about this great Siberian invasion of Europe. But other causes might tend in the same direction, such as want of sufficient food after a few years of great increase of any particular species. It is not known to what we owe the periodic visits of the Central Asiatic Sandgrouse (Syrrhaptes paradoxus), but certain it is that immense flocks of these birds invade Europe from time to time at the present day, just as those mammals may have done in past ages.

Author

The History of the European Fauna
By R. F. Scharff
Published in 1899
Available from gutenberg.org

Posted on

Tuesday 15 December 2020

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661*800

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Birds

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• Natural History / Birds

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