Bees are extremely important to both nature and humans as they pollinate flowering plants. It is believed that one-third of all the food that is produced depends on pollination. Wild bees are regarded as especially efficient pollinators. Landscape ecologists from the University of Freiburg have already set up several bee houses within the city. From these bee houses that are made by the students in the joinery at the Arboretum, wild bees can go about their daily business. At the same time, the bee houses are a place for offspring.