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.

Fabrice Cahez / Red-billed chough (Pyrrhocorax pyrrhocorax) perched on rock with one on right calling, Gorges du tarn, France, January.

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

Jose B. Ruiz / Alpine chough (Pyrrhocorax graculus) on snow, Picos de Europa, Cantabria, Spain

Jose B. Ruiz / Alpine chough (Pyrrhocorax graculus) on snow, Picos de Europa, Cantabria, Spain

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

Nick Garbutt / Pair of Red-billed choughs (Pyrrhocorax pyrrhocorax) on a rocky garden wall. High mountain village, Ladakh, northern India.

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