What mechanism ensures that the larvae of the Bombus vestalis are fed?

Answer

Host workers mistake the parasitic larvae for their own and provide food

The success of the parasitic lineage relies on a manipulation of the host colony's social instincts. Because the parasitic queen has successfully established her eggs within the host nest, the host workers continue their natural instinct to provision the brood. They are unable to distinguish the foreign cuckoo larvae from their own, and consequently, they continue to gather nectar and pollen, feeding these resources to the cuckoo larvae throughout their development. This allows the cuckoo bee to grow and mature without the mother ever needing to gather food for her young.

What mechanism ensures that the larvae of the Bombus vestalis are fed?
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