Ключевые слова: action, aggressively, amazing, back, beak, belly, bill, bird, birds, birdwatching, blackcock, breast, capercaillie, claw, clawing, courtship, cruel, duel, eyes, face, feather, feathers, fight, fighter, head, incredible, lek, lekking season, mating season, moorland, nature, one on one, ornithology, plumage, plume, red oboe, spring, struggle, swamp, sweden, tail, talon, tetrao urogallus, to the death, viciously, violently, wing, wings, wrestle,