Paul Evans: How to See Nature (2018):
“…the equally enigmatic insects, such as the huge emperor moth and the ginger-bottomed bilberry bumblebee*…”.
M Edwards, for Bees, Wasps & Ants Recording Society:
“There are clear flower-visiting preferences for this species*, with bilberries (Vaccinium spp.) and sallow (Salix spp.) being much used in spring; bird’s-foot trefoil (Lotus corniculatus), clovers (Trifolium spp.) and raspberry (Rubus idaeus) and bramble (Rubus fruticosus agg.) in early to mid summer and bell heather (Erica cinerea) and bilberries in mid to late summer.
It is likely that this species is attacked by the socially parasitic bee, Bombus sylvestris.”