Psithyrus

Rarity: Common

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At a glance

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In collections

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What Wikipedia says

Cuckoo bumblebees are members of the subgenus Psithyrus in the bumblebee genus Bombus. Until the 1990s, Psithyrus was considered to constitute a separate genus. They are a specialized socially parasitic lineage which parasitises the nests of 'true' bumblebees; they do not collect pollen or establish their own nests.

Excerpt from the Wikipedia article “Psithyrus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: FSI, Public domain, via Wikimedia Commons.