Stefan F. Wirth<p><a href="https://biologists.social/tags/Bumblebee" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Bumblebee</span></a> <a href="https://biologists.social/tags/Bombus" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Bombus</span></a> <a href="https://biologists.social/tags/ruderarius" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ruderarius</span></a> is widespread throughout Europe, but is threatened by habitat loss due to agriculture, thus is labeled <a href="https://biologists.social/tags/endangered" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>endangered</span></a> on the <a href="https://biologists.social/tags/IUCNRedList" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>IUCNRedList</span></a>. It prefers open areas, where its <a href="https://biologists.social/tags/nest" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>nest</span></a> houses up to 100 workers.<br>M. Terzo et al. (2005) found the secretions of <a href="https://biologists.social/tags/labialglands" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>labialglands</span></a> of B. ruderarius and closely related B. <a href="https://biologists.social/tags/sylvarum" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sylvarum</span></a> differing only in their relative concentration. </p><p>© <a href="https://biologists.social/tags/StefanFWirth" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>StefanFWirth</span></a> <a href="https://biologists.social/tags/Berlin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Berlin</span></a> 2025</p><p>Ref<br>M. Terzo et al. (2005)<br><a href="https://doi.org/10.1051/apido:2004072" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">doi.org/10.1051/apido:2004072</span><span class="invisible"></span></a></p><p><a href="https://biologists.social/tags/Photos" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Photos</span></a> <br>© S. F. Wirth</p>