Very large Grouse (weighing up to 7kg or about 16lbs). Male (pictured) is mostly black, blue/black with white shoulder patch and black/brown wings, with white scaling around lower breast vent and around the tail. Bill is straw yellow. When displaying the male fans his tail up, drops his wings and stretches his neck and head up extending short feathers on the upper throat.
This displaying male was found east of Kuusamo in mixed woodland in Northern Finland about 20km west of the Russian border.
This species is the largest grouse. The males are extremely aggressive when lekking. There are several well documented instances of this bird attacking humans that venture to close.