Megachile rotundata, commonly known as the alfalfa leafcutter bee, is a solitary bee species belonging to the family Megachilidae. It is native to Europe but has been introduced to various regions worldwide for its role as a pollinator of alfalfa crops. These bees are medium-sized, with a robust body and a round shape, hence the species name "rotundata." They are known for their distinctive behavior of cutting circular pieces of leaves to construct their nests.