Ключевые слова: adult, animal, babies, baby, barn, begging, being, birds, breeding, brood, building, calling, ceiling, chick, chicks, clinging, estonia, estonian, europe, european, farm, fauna, feather, feathers, fed, feed, feeding, fledge, food, four, gape, group, having, hirunda, hirundo, home, hungry, just, juvenile, many, martin, migratory, mud, national, nature, nest, nesting, nestling, parent, passerine, plumage, portrait, rustica, sibling, side, smal, spring, springtime, streamers, summer, swallow, swallows, tail, the, them, unfledged, wall, wild, wildlife, with, yellow award, young,