Cuckoo bees sneakily lay their eggs in the nests of other bee species, after which their newly hatched prodigies kill the host egg or larva, and then feed on the stored pollen. The host, a solitary bee, never knows anything is awry. Nine new species of these clandestine bees have been found hiding in collections and museums across North America by York University PhD Candidate Thomas Onuferko, as well as another six unpublished in a decades old academic thesis.