Females of Andrena carontonica share a common entry during nesting. Underground however each female takes care of her own chamber. Using the same entrance without being a real structured community is called communal. Because many chambers share one exit, fresh animals meet eachother in this exit while trying to get out for the first time in spring. Males try to mate immediately, so in many cases the females have been fertilized even before seeing daylight. In Dutch this Mining Bee is called the Hawthorn Bee
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/43272765@N04">gailhampshire</a> from Cradley, Malvern, U.K
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/gails_pictures/6892592426/">Andrena ( possibly carantonica). Female</a>