Best Psithyrus
Bombus variabilis is a species of cuckoo bumblebee native to North America, placed in the subgenus Psithyrus. It is a social parasite that does not construct its own colony but instead invades the nests of other bumblebee species, relying on the host workers to rear its offspring. The species has ex...
Bombus suckleyi, Suckley's cuckoo bumblebee, is a North American social parasite that specifically targets the resource-rich nests of orange-belted bumblebees in the western US.
Bombus rupestris is a large cuckoo bumblebee found across Europe, notable as an obligate social parasite that invades the established nests of the red-tailed bumblebee species.
Bombus campestris, the field cuckoo bumblebee, is a widespread Eurasian insect distinguished by its parasitic lifestyle, laying its eggs in the nests of other bumblebee species.
Bombus sylvestris, known as the forest cuckoo bumblebee, is a parasitic species native to Europe and Asia that specifically targets the established nests of early-nesting bees.
Bombus insularis, the indiscriminate cuckoo bumblebee, is a North American parasite notable for its broad host range, invading the colonies of numerous other bumblebee species.
Bombus citrinus, the lemon cuckoo bumblebee, is a North American species recognized by its bright yellow thorax and its parasitic behavior of usurping ground-nesting bee colonies.
