Hermann Brehm / Male Andean Cock-of-the-Rock (Rupicola peruvianus) displaying. Cock-of-the-Rock Lodge, Peru, August.

Hermann Brehm / Male Andean Cock-of-the-Rock (Rupicola peruvianus) displaying. Cock-of-the-Rock Lodge, Peru, August.

Fergus Gill / Red grouse (Lagopus lagopus scoticus), portrait of a cock bird displaying to rival males. Cairngorms National Park, Scotland, April

Pete Oxford / Andean cock-of-the-rock male {Rupicola peruvianus} Manu Cloud Forest, Peru

David Tipling / Cock-of-the-rock {Rupicola peruvianus} male at lek in cloud forest, Manu Biosphere Reserve, Peru.

David Tipling / Cock-of-the-rock {Rupicola peruvianus}, male, at lek in cloud forest, Manu Biosphere Reserve, Peru.

Mike Read / Andean cock of the rock female sitting on nest {Rupicola peruvianus} Tandayapa, Ecuador, South America

Pete Oxford / Cock of the Rock (Rupicola peruvianus) male at lek. Manu cloud forest, Peru, South America

Pete Oxford / Guianan cock-of-the-rock (Rupicola rupicola) Kaieteur Falls, Kaieteur National Park, in Essequibo, Guyana, South America

Ben Lascelles / Andean Cock of the rock (Rupicola peruvianus) male at lek, Jardin, Colombia

Ben Lascelles / Andean Cock of the rock (Rupicola peruvianus) male at lek, Jardin, Colombia

Ben Lascelles / Andean Cock of the rock (Rupicola peruvianus) male calling at lek, Jardin, Colombia