Two mud filled holes in our box designed for solitary bees. They've been filled in for about a month. Not sure what is hatching there!
No identification made yet.
No interactions present.
Interesting. Keep us posted!
University of Edinburgh and Biodiversity Observatory (OU)
Most likely red mason bees - Osmia bicornis (=rufa). Hope you're not expecting them to hatch anytime soon, because if they were filled-in a month ago, the resultant bees wont emerge until next spring.
Yes, I've been watching Red Mason Bees completing nests with mud, in my "Bee Hotel". Look just the same.
Lat/Lng: 53.7, -2.9
OS grid ref: SD4331