Bees are winged insects that form a monophyletic clade Anthophila within the superfamily Apoidea of the order Hymenoptera, with over 20,000 known species in seven recognized families. Some species – including honey bees, bumblebees, and stingless bees – are social insects living in colonies, whereas over 90% of bee species – including mason bees, carpenter bees, leafcutter bees, and sweat bees – are solitary.