Endangered-hosts
Guides
Bombus citrinus
lemon cuckoo bumblebee
Bombus citrinus is a cuckoo bumblebee native to eastern North America, recognized by its lemon-yellow coloration. As an obligate social parasite, it invades colonies of other bumblebees, kills the resident queen, and assumes control of the host worker population. It belongs to the subgenus Psithyrus, a group of parasitic bumblebees that have lost the ability to collect pollen and rear their own workers.