What specific anatomical structure, crucial for pollen transport, is lacking in cuckoo bumblebees?

Answer

Corbiculae

Social bumblebees possess corbiculae, specialized structures on their hind tibiae known as pollen baskets, used for carrying pollen back to the nest. Cuckoo bumblebees lack these structures because they do not forage for pollen.

What specific anatomical structure, crucial for pollen transport, is lacking in cuckoo bumblebees?
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