What behavior defines the parasitic nature of the Vestal Cuckoo Bumblebee?

Answer

Invading the nests of other species to have young raised by hosts

This species functions as a social parasite, meaning the female queen lacks the physiological drive and structural ability to build her own nest or rear her own workers, forcing her to infiltrate and exploit the colony of a host species instead.

What behavior defines the parasitic nature of the Vestal Cuckoo Bumblebee?
taxonomyanimalinsectbeeclassification