By Pammie
Cambridgeshire,
United Kingdom 
Noticed in my Sons garden , when looking up in the tree at the small BIRDHOUSE I had given to my grandchildren ,(it being fixed fairly high in a tree ) 🐝Bees going in & out of it Is it Safe ? . Don’t want the Swarm to get out of hand
18 May, 2021
Answers
Lucky you! Could certainly do with a few bees here...
18 May, 2021
Sound like tree bumble bees. No real concern but don't poke the nest etc. We have had them a few times and they dont stay for long.
Find about them in the link below.
https://www.bumblebeeconservation.org/tree-bumblebee-bombus-hypnorum/
18 May, 2021