> First cleansing flight dates in our study advanced by over 1 month during the 25 years that observations were kept. Advancement of first cleansing flights in spring is similar to changes reported in first appearance dates of other insects, including other hymenopterans like wasps 

> Some early plant species with mean phases in February and March have advanced by an average of 20 days over the period 1977 -- 2007 in the nearby Poznan Botanical Garden but bee cleansing flight changes have advanced even more, in a slightly shorter period, than these potential environmental cues. 

> In this study, we can report a major advance in the first cleansing flight dates of the honeybee in Poland, and have very strong evidence this is attributable to the increasing temperatures the species is experiencing over the preceding year. 

Advances in the timing of spring cleaning by the honeybee Apis mellifera in Poland, TIM H. SPARKS, et al. Ecological Entomology
Volume 35, Issue 6, pages 788–791

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