Black grouse ( Lyrurus tetrix ) male displaying on snow, Prealps, Switzerland .

mountain spring adult male alone posing courtship behaviour profile shot overview twilight switzerland black grouse (lyrurus tetrix) lyrurus prealps (mountain range) least concern (iucn) lc april lek mating arena nobody natural area temperate season seasons atmosphere stage of development individual enumeration reproductive behaviour behavior shot atmosphere (ambiance) europe eurasia old world continent grouse (tetras) gallinacean bird wild animal tetraonidae galliformes aves vertébré alps (range) world mountain and summit low risk (iucn) lr iucn red list of threatened species species month of year tetrao tetrix lyrurus tetrix