Ключевые слова: active, aculeata, animal, animalia, apiary, apocrita, apoidea, arthropod, arthropoda, austria, bee, bee garden, beekeeper, bulrush, cane, crawl, eggs, europe, fauna, fluffy, flying, fruit trees, garden, hollow, horizontal, house, hymenoptera, in flight, insect, insecta, insects, jedlesee, landscape, mason, megachilidae, nature, nesting aid, osmia, osmia red, osmia rufa, partition, pollen, pollinate, return, single, spring, tube, vienna, wild,