Janean Sharkey on Twitter: "Cuckoo bumblebees are #cleptoparasites, which means they lay eggs in the nest of other bumblebees. B. citrinus is known to parasitize the nests of B. impatiens, B. bimaculatus
![Cuckoo bumblebee, Cuckoo Bee (Bombus rupestris, Psithyrus rupestris), on a leaf, Germany, Stock Photo, Picture And Rights Managed Image. Pic. BWI-BS341472 | agefotostock Cuckoo bumblebee, Cuckoo Bee (Bombus rupestris, Psithyrus rupestris), on a leaf, Germany, Stock Photo, Picture And Rights Managed Image. Pic. BWI-BS341472 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/c738069701fadc1743f0ebf50445abdc/bwi-bs341472.jpg)
Cuckoo bumblebee, Cuckoo Bee (Bombus rupestris, Psithyrus rupestris), on a leaf, Germany, Stock Photo, Picture And Rights Managed Image. Pic. BWI-BS341472 | agefotostock
![Male Gypsy Cuckoo Bumble Bee (Margarita Miklasevskaja, 2001) -Bumble... | Download Scientific Diagram Male Gypsy Cuckoo Bumble Bee (Margarita Miklasevskaja, 2001) -Bumble... | Download Scientific Diagram](https://www.researchgate.net/profile/Ben-Collison/publication/340333377/figure/fig1/AS:875376758771713@1585717491675/Male-Gypsy-Cuckoo-Bumble-Bee-Margarita-Miklasevskaja-2001-Bumble-Bees-of-North.png)