I was at the England v Sri Lanka T20 cricket match in Bristol last Saturday and was struck by the amount of bumble bees that were flying around!
There were quite a few in the food area behind one of the stands and during the match I saw a bee every few minutes for the duration, flying around investigating people as they sat and watched the game.
I'd say they were predominantly male (due to size) and I think they had white tails.
Just thought it was interesting!