Two male Black Grouse (Lyrurus (Tetrao) tetrix) fighting on the lek, April 8, Badenoch & Strathspey, Scotland

Male Black Grouse are also known as Blackcocks, and females as Greyhens. In the spring the males accumulate before dawn in traditional lekking areas to strut, display and fight while producing distinctive calls. Females are attracted to the lek and mate with the victor.