Ключевые слова: above, air, animal, beak, bird, black, blue, cable, cute, danger, day, diagonal, electric, electricity, environment, fauna, feather, flock, flying, freedom, group, hirundinidae, isolated, line, lines, many, martin, nature, ornithology, perched, power, rest, silhouette, sit, sky, swallow, swarm, urban, white, wild, wildlife, wing, wire,