A couple of years ago, my daughter gave me a bee house as a Christmas present. I put it up in a sunny part of the garden and waited. I can see it from my office window.
It’s had a few solitary bees buzzing about it and even a couple of Bumble Bees, but this year it seems to be Honey Bees that are attracted by it.
I was watching them all buzzing around and then noticed a strange behavioural pattern. If you look closely at about 0:30 you will see a bee go forwards into one of the holes, then reverse out, turn around, and go back in backwards.
I’ve seen this happen many times but I can’t see a reason. I think these are worker bees. As far as I know they only forage, they don’t build new combs.