Ключевые слова: adult, amazing, animal, aves, avian, background, beautiful, beauty, bird, birds, cable, elegant, europe, european, fall migration, fast, green, group, high, landing, metal, migration, migratory, naturally, nest, outdoors, passerine, passerine bird, perched, perching, quick, resting, riparia riparia, sand, sand martin, sky, small, small bird, songbird, speed, spring migration, stretching, summer, swallow, swallows, swift, tree, vivid, wild, wildlife,