black grouse sitting in pine tree. lekking bird grouse, tetrao tetrix, in forest marshland, sweden. spring mating season in nature

animal beak bird birdwatching black bog call cold czech dark environment estonia fauna fen finland forest game gorgeous grass grouse lek lekking male marshland mating meadow morning nature nice norway ornithology playing plumage poland portrait red rime season slovakia spring springtime sunrise sweden tetrao tetrix wetland wild wildlife