The Black Grouse or Blackgame (Tetrao tetrix) is a large bird in the grouse family. It is a sedentary species, breeding across northern Eurasia in moorland and bog areas near to woodland, mostly boreal. The Black Grouse is closely related to the Caucasian Black Grouse. Black Grouse is a large bird with males being 24–27 centimetres (9.4–11 in) long and weighing 1,000–1,450 grams (2.2–3.2 lb) and females 21–24 centimetres (8.3–9.4 in) and weighing 750–1,110 grams (1.7–2.4 lb) The cock is very distinctive, with black plumage, apart from red wattles and a white wingbar, and a lyre-shaped tail, which appears forked in flight. His song is loud, bubbling and somewhat dove-like. The female is greyish-brown and has a cackling call. She takes all responsibility for nesting and caring for the chicks, as is typical with gamebirds. Greyhens are solely responsible for hatching and rearing the young. The nest is usually on the ground, but it can be low in a bush in the old nest of another species. Greyhens normally lay between 8 -10 eggs from mid May. The eggs are incubated for about 24 days.