is a solitary bee that belongs to the Megachilidae. It collects pollen on the stomach instead of on the legs as honey bees and bumblebees do. Osmia bicornis does so because it lives in hollow straws or tubular holes made by insects in dead wood, where the pollen otherwise would have been rubbed of.
Osmia bicornis is one of the species that often is nesting in bee hotels. In Germany Osmia bicornis is commercially managed to support pollination.