Western Capercaillie

The Western Capercaillie is the largest living grouse and a heavy, mainly ground-dwelling forest bird. The sexes differ dramatically: males are nearly twice the size of females and typically measure 74–85 centimetres, span 90–125 centimetres, and average about 4.1 kilograms. Plumage varies geographically, but males become progressively whiter beneath toward Siberia, whereas females vary less. Its bulky form, large rounded tail, and marked size difference between cock and hen help distinguish this non-migratory Palearctic grouse. (Wikipedia, Western Capercaillie account)

Western Capercaillies occupy mature conifer forests with varied tree composition and a comparatively open canopy. Adults eat buds, leaves, berries, grasses, insects, and fresh shoots; in deep winter they spend much of their time in trees consuming spruce, pine, or fir needles. Spring males gather at leks, fanning their tails, puffing their chests, and producing whistles and clicks. Females make ground nests from vegetation and feathers, laying about five to eleven eggs. Newly hatched chicks depend heavily on protein-rich invertebrates before shifting toward plant foods. (Woodland Trust and Wikipedia accounts)