Bombus fernaldae, the Fernald's cuckoo bumblebee, is a species of cuckoo bumblebee having only males and queens, but no worker bees.

The females place their eggs in the nest of the confusing bumblebee (Bombus perplexus) or the red-belted bumblebee (Bombus rufocinctus), which raise the larvae.

Fernald's cuckoo bumblebees visit flowers of Potentilla, Rubus, clovers, and goldenrods.

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