What is the fundamental behavioral difference between the Yellowish Cuckoo Bumblebee and common bumblebees regarding resource management?

Cuckoo females invade host nests, leaving all pollen and nectar collection to the host colony.

The Yellowish Cuckoo Bumblebee is classified as a social parasite because its reproductive strategy relies entirely on infiltration rather than independent colony building. Unlike common bumblebees, which diligently gather nectar and pollen to provision their own developing young within a colony they establish, the parasitic female invades an existing host nest. Once established, the entire responsibility for foraging, pollen collection, and rearing the brood falls solely to the workers and queen of the host species. This fundamental delegation of labor dictates the physical adaptations observed in the parasitic female, most notably the lack of structures designed for carrying those collected resources.