Photographed this bee in Larose Forest today. This is often called a Cuckoo Bee because it lays its eggs in the nests of other bee species (as European cuckoos do with other birds). It primarily seeks out Andrenid bees and sweat bees, and if you see Nomadas patrolling a little way above the ground, you can be sure there'll be at least one species, if not several, of the Andrenids and Halictids (sweat bees). You can see this Nomada is covered in pollen. They don't gather pollen as most bees do (they have no scopae, or special hairs for doing so), but the pollen collects on their bodies anyway, as they seek nectar. This one is probing freshly opened willow flowers.

These bees actually look more wasp-like than bee-like, and are often mistaken for small wasps, an easy mistake to make.