What ecological function do cuckoo bumblebees serve regarding the populations of their host species?

Answer

They act as a natural check on host population density

By attacking and taking over established colonies, cuckoo bumblebees regulate the numbers of their specific host species, preventing any single host species from becoming overly dominant in the ecosystem.

What ecological function do cuckoo bumblebees serve regarding the populations of their host species?
behaviorbumblebeecuckoo