Ключевые слова: 2, animal, animals, beak, biology, bird, black, blue, couple, courting, courtship, crest, crested, dance, environment, europe, european, factual, fauna, german, germany, great crested grebes, grebe, horizontal, long, mate, mated, nature, no people, orange, ornithology, pair, podiceps cristatus, podicipedidae, pond, reproduction, science, season, sky, spring, springtime, two, water bird, waters, white, wildlife, zoology,