Our smallest domestic animals, the honey bees, belong to the insect order of hymenoptera just like bumblebees, wasps and ants. Many of these insects live in huge colonies with division of labour and a caste system. However, there also are less conspicuous small hymenoptera like, for instance, the mason- bee, which on its own builds complex nests for its offspring and supplies it with food. We haven’t even noticed that it has followed us into our human settlements and we don’t consider that we are taking away the habitats from these small interesting insects. This film pays attention to all these important plant pollinators, allows insights into the work of bees and wasps and shows how we can observe and protect them.