Chambers's Journal of Popular Literature, Science, and Art, Fifth Series, No. 31, Vol. I, August 2, 1884

Chambers's Journal of Popular Literature, Science, and Art, Fifth Series, No. 31, Vol. I, August 2, 1884

Chambers's Journal of Popular Literature, Science, and Art, Fifth Series, No. 31, Vol. I, August 2, 1884The...
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Chambers's Journal of Popular Literature, Science, and Art, Fifth Series, No. 31, Vol. I, August 2, 1884

Chambers's Journal of Popular Literature, Science, and Art, Fifth Series, No. 31, Vol. I, August 2, 1884

CHF 11.72 CHF 5.86

Chambers's Journal of Popular Literature, Science, and Art, Fifth Series, No. 31, Vol. I, August 2, 1884

CHF 11.72 CHF 5.86
Author: Various
Format: eBook
Language: English

Chambers's Journal of Popular Literature, Science, and Art, Fifth Series, No. 31, Vol. I, August 2, 1884

The migration of birds is a subject that has excited the attention of naturalists of all nations from very early times, and many theories have been advanced to account for the mysterious periodical movements that take place among the feathered tribes, although it can hardly be said there is one which fully explains these movements. Some writers affirm that they are entirely due to temperature; others, that they are caused by a want of food; while others, again, assert that they are traceable, within certain limits, to a hereditary impulse which guides birds in following lines of flight over seas where at one time all was land. There can be no doubt that originally, birds, like other animals, were actuated to a great extent in their periodical shiftings by the main considerations of food and temperature. As familiar examples of this, we have only to remember that species which are reared within the Arctic Circle are compelled to quit their birthplaces as soon as the brief summer is pasttheir haunts becoming wrapped in snow, and their feeding-grounds converted into a dreary expanse of ice; while in our own country, every one knows that swallows and other soft-billed birds are obliged to leave us at the close of autumn, and repair to climes where there is not only greater warmth but abundance of insect life, on which their subsistence depends. ......Buy Now (To Read More)

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Ebook Number: 65985
Author: Various
Release Date: Aug 3, 2021
Format: eBook
Language: English

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