Working on Grindelia. Leaf-cutter bees are fairly ubiquitous and diverse. They do not have pollen sacs on their lags but sport long hairs on the underside of the abdomen for pollen collection. Once the hairs are full of pollen, the bee seems to raise the abdomen high to avoid rubbing their cargo off as they feed. Their name comes from their practice of cutting circular holes from leaves, which they use to seal the chambers in their nests. Nests are built in pre-existing chambers in wood or on the ground.