Cropped image from [1], which is in the Public Domain
Originally uploaded on en: 15:32, 13 March 2003 by en:User:Cordyph
Licensing
This image comes from the book:
Naumann, Naturgeschichte der Vögel Mitteleuropas. 3. Aufl. Neubearb. von G. Berg et al. Hrsg. von Carl R. Hennicke. (Naumann, Natural history of the birds of central Europe, 3rd Ed. Revised by G. Berg et al.; Edited by Carl R. Hennicke.) of 1905 or his earlier works.
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.
From en: Mistle thrush Cropped image from [http://www.biologie.uni-hamburg.de/b-online/birds/2181_26.htm], which is in the Public Domain {{NAUMANN}} Originally uploaded on en: 15:32, 13 March 2003 by en:User:Cordyph