Bluetits v Bumblebees

Last year the bluetits in our birdbox were ousted by the bumblebee, so we were not optimistic this year when a bee appeared again shortly after the bluetit got settled.  However this year the birds and the bees seemed to co-habit very happily.  The bluetit has successfully hatched 7 babies and has launched them out into the world.  The box is now left to the bees on their own.