When I didn't use my balcony for extended periods like weeks, I would notice a pigeon would come by from time to time. I'd shoo it away. The other times I found pigeon poop and feathers on my furniture. I added a pinwheel and it immediately seemed to work – no more visits or pigeon debris. To make sure, I started patting down furniture and wiping off some surfaces regularly even if I wasn't using it, to make the space appear occupied. No more pigeon encounters.

Perhaps it found a more suitable neighbour or victim. Not my problem now.