Ключевые слова: animal, beak, beautiful, bird, bird watching, birdhouse, birdnest, black, black woodpecker, brood, cavity, cavity nest, chamber, dryocopus, dryocopus martius, eating, european, family, fauna, feather, feed, feeding, feeding chick, foraging, forest, habitat, hole, hollow, male, martius, nature, nest, nesting behavior, nesting ground, nesting hole, nobody, nurture, ornithology, parent, peck, pecker, picidae, piciformes, snest, tree, trunk, wild, wildlife, wood, woodpecker,