This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: separate one species. The original can be viewed here: Pterocles sp.jpg: . Modifications made by Osado.
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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.
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