Lumber, Rug, Plant, Cork, insect house, nest, insect hotel, help, holes, tunnel, wooden, pollinator, fauna, nests, closed, filled, Osmia cornuta, the European orchard bee, closeup, Germany, wildlife, endangered, species, spring, life, district, opening, photograph, invertebrate, arthropod, insect, burrow, germany, animal, aid, hole, assistance, european country