Erlend Haarberg / Male Great snipe (Gallinago media) calling during display, Sor-Trondelag, Norway, May

Erlend Haarberg / Male Great snipe (Gallinago media) displaying, Norway, June

Sven Zacek / Two Black Grouse (Tetrao tetrix) fighting at a lek. Virumaa, Estonia, Europe, April.

Stephane Granzotto / Male Black grouse (Tretrao tetrix) displaying at lek before taking off, Rhone-Alpes, France, May.

Stephane Granzotto / Male Black grouse (Tretrao tetrix) displaying at lek, chases another male away, Rhone-Alpes, France, May.

Stephane Granzotto / Two male Black grouse (Tretrao tetrix) displaying ta lek, Rhone-Alpes, France, May.

Gerrit Vyn / Female Greater Sage-Grouse (Centrocercus urophasianus) visiting a lek of displaying males. Sublette County, Wyoming. April.

Erlend Haarberg / Capercaillie (Tetrao urogallus) male displaying portrait, Vauldalen, Norway April

SCOTLAND: The Big Picture / Two Black grouse (Tetrao tetrix) males fighting at lek, Cairngorms National Park, Grampian, Scotland, UK, May 2015.

SCOTLAND: The Big Picture / Black grouse (Tetrao tetrix) male peforming flutter jump display at lek, Cairngorms National Park, Scotland, UK, May 2015.

SCOTLAND: The Big Picture / Black grouse (Tetrao tetrix) male displaying at lek, Deeside, Cairngorms National Park, Scotland, UK, April.

Loic Poidevin / Ruff (Philomachus pugnax) male displaying, Varanger, Norway, May 2016