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  Category:Young birds – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Young_birds?uselang=de

  Keine Beschreibung vorhanden.

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  Biology of Behaviour: Mechanisms, Functions and Applications - D. M. Broom, D. Broom - Google Books

  https://books.google.de/books?id=5kI5AAAAIAAJ&dq=Biology+of+behaviour:+mechanisms,+functions+and+applications

  First published in 1981, this book is an introduction to studies of the behaviour of a wide variety of animals including man, farm animals and pest species. The approach is ethological and much reference is made to detailed description of behaviour and to…

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