| 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 |
Comment: Earlier works include:
- Naumann, Naturegeschichte der Vogel Mitteleuropas: Band V, Tafel 2 - Gera, 1899
- Naturgeschichte der Vögel Mitteleuropas Gera, 1897
- Naturgeschichte der Vögel Mitteleuropas, 1. Auflage (1796-1803)