tailieunhanh - BIRDS (Britannica Illustrated Science Library)

Many species undertake long distance annual migrations, and many more perform shorter irregular movements. Birds are social; they communicate using visual signals and through calls and songs, and participate in social behaviours, including cooperative breeding and hunting, flocking, and mobbing of predators. The vast majority of bird species are socially monogamous, usually for one breeding season at a time, sometimes for years, but rarely for life. Other species have polygynous ("many females") or, rarely, polyandrous ("many males") breeding systems. Eggs are usually laid in a nest and incubated by the parents. Most birds have an extended period of parental care. | About the pagination of this eBook Due to the unique page numbering scheme of this book the electronic pagination of the eBook does not match the pagination of the printed version. To navigate the text please use the electronic Table of Contents that appears alongside the eBook or the Search function. For citation purposes use the page numbers that appear in the text. BIRDS Britannica Illustrated Science Library Encyclopedia Britannica Inc. Chicago London New Delhi Paris Seoul Sydney Taipei .

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