I'm not sure. He doesn't seem to hunt for food, although having said that, he's just darted into his gap from a different direction, so maybe he has separate entry and exit points.
It's a long hedge, and there are lots of birds in it - it's like an apartment block
. There must be some protocols between them, but I can't work out what. They don't fight, and I don't suppose there will be babies at this time of year. A blackbird and some sort of finch/tit uses the same gap as a front door though. I'm not too sure what goes on further down, as the bit in the photo is what I can see from 'my' seat without moving, and if I move too much they all hide.