#Bumblebee #Bombus #ruderarius is widespread throughout Europe, but is threatened by habitat loss due to agriculture, thus is labeled #endangered on the #IUCNRedList. It prefers open areas, where its #nest houses up to 100 workers.
M. Terzo et al. (2005) found the secretions of #labialglands of B. ruderarius and closely related B. #sylvarum differing only in their relative concentration.

© #StefanFWirth #Berlin 2025

Ref
M. Terzo et al. (2005)
https://doi.org/10.1051/apido:2004072

#Photos
© S. F. Wirth