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Sylvia curruca (up), Sylvia communis (middle) and Sylvia borin (bottom)
Source: http://www.biologie.uni-hamburg.de/b-online/birds/2181_40.htm
aus: NAUMANN, NATURGESCHICHTE DER VÖGEL MITTELEUROPAS: Band II, Tafel 11 - Gera, 1897 digitale Bearbeitung : Peter v. Sengbusch - b-online@botanik.uni-hamburg.de
 |
This image comes from the book Naumann, Naturgeschichte der Vögel Mitteleuropas (Natural history of the birds of central Europe) of 1905 or his earlier works. The copyrights for those books have expired and this image is in the public domain. See here |
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