Mean flight activity from overwinteredApis melliferaL. colonies was usually greater and the quantity of pollen trapped was well in excess of that from disposable pollination units (DPU's). However, comparisons between individual units indicated that DPU's exhibit more uniform flight activity than colonies. Data pertinent to the effect of this atypical domiciliary crowding and colony makeup on longevity, development, and certain behaviorial adaptations of the bees are included.