© Marcel Burkhardt
Swiss Ornithological Institute
Tel. 041 462 97 00
Fax 041 462 97 10
Donations: PC 60–2316–1
3w-publishing ag, Langenthal
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„Swiss Ornithological Institute“ is a protected and registered name.
The use of the Swiss Ornithological Institute’s logo requires the express consent of the Swiss Ornithological Institute in Sempach.
The use of images, photographs, texts and recordings of any kind is not permitted without the written consent of the Swiss Ornithological Institute and is only permitted with the citation of copyright.
The authors maintain all rights of the used pictures. The Swiss Ornithological Institute cannot confer any rights for further use.
The authors maintain the rights of the sound documents. The Swiss Ornithological Institute cannot confer any rights for further use. The sound documents were issued by E. Arendt/H. Schweigert (4), P. Becker (1), H.-H. Bergmann (296), P. Feindt (1), M. Förschler (1), K.-H. Frommolt/G.Tembrock (5), K.-H. Gaberding (2), D. Helbig-Liebers (1), M. Koch (10), W. Krey (25), F. Nurnberger/D. Siebold (1), M. Schubert (18), A. Schulze, AMPLE-Verlag (1).