The Caucasian grouse typically forages just after daybreak and towards dusk (3). In winter, a variety of plants form the basis of its diet, including birch buds and catkins, juniper fruits, various shrub shoots and rosehips. In other seasons, the Caucasian grouse has a more diverse diet, feeding on a multitude of herbs and grasses, as well as seasonally available buds, leaves and fruit (4) (8). Arthropods are a diet staple of chicks in the first two weeks after hatching, but are rarely taken by adults (3).
The traditional leks of the male Caucasian grouse occur in spring and are carried out in open habitat away from the treeline (4). The display involves short bursts of fast-paced running, alternated with upward jumping and periods of standing still. When the males come within four to five metres of each other, they elevate their long tails and begin to walk parallel to one another (9). Although the male Caucasian grouse is almost mute, a soft whistling sound is made by the wings during display (2).
Unlike the male Caucasian grouse, the female is not mute and has a cackling call (2). In May, the female lays between two and ten eggs at a time, in a shallow ground scrape concealed by vegetation. The eggs are incubated for 20 to 25 days, and the chicks are able to fly 10 to 14 days after hatching (3).