Which species serve as the primary hosts for the Vestal Cuckoo Bumblebee?

Answer

Bombus terrestris and Bombus cryptarum

The Vestal Cuckoo Bumblebee, known as Bombus vestalis, acts as a social parasite, which requires it to infiltrate the established colonies of specific host species. The primary hosts targeted by this bee are the buff-tailed bumblebee, scientifically named Bombus terrestris, and the closely related species Bombus cryptarum. The cuckoo queen selects these specific colonies because they are social organisms that have already invested significant energy into establishing a workforce and accumulating the nectar and pollen stores that the parasitic larvae rely on for development.

Which species serve as the primary hosts for the Vestal Cuckoo Bumblebee?
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