Mason Bee

Mason bees are close relatives to leafcutter bees, can carry pollen under their abdomen. Osmia bees, one is shown here, emerge early in the spring and pollinate early flowering plant species, including many important crops. They are commonly called masons as they build their nests from mud or leaf pieces which are chewed up into a pulp; this materials are used to shape the single brood cell. Most species nest in pre-existing holes in wood, though a few nest under rocks.