David Pattyn / Alpine chough (Pyrrhocorax graculus) group in flight, Bernese Alps, Switzerland, November

David Pattyn / Alpine chough (Pyrrhocorax graculus) in flight. Stelvio National Park, Italian Alps, Solda, Sulden am Ortler, Sudtirol, Italy. January 2013.

Philippe Clement / Alpine Chough / Yellow-billed Chough (Pyrrhocorax graculus) flock in flight against mountains, Dolomites, Italy. Digital composite.

Nick Upton / Alpine / Yellow-billed chough (Pyrrhocorax graculus) flying past waterfall and sheer cliffs of the Cirque de Gavarnie, Haute Pyrenees, France.

Wild Wonders of Europe / Schandy / Mount Donguzorun (4,448m) with Yellow-billed / Alpine chough (Pyrrhocorax graculus) flying, Caucasus, Russia, June 2008.

Wild Wonders of Europe / Schandy / Apline / Yellow-billed chough (Pyrrhocorax graculus) in flight, Mount Elbrus, Caucasus, Russia, June 2008

Oriol Alamany / Yellow-billed chough (Pyrrhocorax graculus) flying through snow in Kibber, Spiti Valley, Cold Desert Biosphere Reserve, Himalaya, Himachal Pradesh, India, March

David Pattyn / Alpine chough (Pyrrhocorax graculus) sitting on a lens of a wildlife photographer, Leukerbad, Vallais, Wallis, Switzerland, January

David Pattyn / Alpine chough (Pyrrhocorax graculus) in snow, Gran Paradiso National Park, Aosta Valley, Italy, April

David Pattyn / Alpine chough (Pyrrhocorax graculus) in snow covered landscape, Gran Paradiso National Park, Aosta Valley, Italy, April

Konrad Wothe / Alpine chough (Pyrrhocorax graculus) flying over mountain top, Karwendel, Alps, Upper Bavaria, Germany. April

Konrad Wothe / Alpine chough (Pyrrhocorax graculus) group of three in snow, Karwendel, Alps, Upper Bavaria, Germany. April