What fundamental requirement for raising larvae do cuckoo bumblebees completely fail to provide for themselves?

Answer

Collection of pollen and nectar

Cuckoo bumblebees do not collect pollen or nectar because they have no capacity or need to provision their own young, relying entirely on the host workers to feed the parasitic larvae.

What fundamental requirement for raising larvae do cuckoo bumblebees completely fail to provide for themselves?
behaviorbumblebeecuckoo