An increasing number of studies show that urbanized areas are habitats of high biological value and ecological significance. Most bee species live in areas altered by man. either in cities - fragmented urban habitats - or in large rural monocultures. Our research is based on three-year observations of population development of the solitary bee Osmia rufa L. https://thegreensjunglebeautyshops.shop/product-category/makeup-sponge/