I don’t know why this didn’t occur to me sooner, but the bird feeder I use has always been a bit of a struggle for the pigeons to feed from. And there’s always something of a battle amongst the pigeons for perch space.
It finally hit me that I should just do away with the feeder altogether and spread the bird seed on the ground. I did this for the first time today (after sweeping up the area first, which I’m now going to have to do regularly). Feeding was very civilized as a result!
Three cups of birdseed was also gone by the time I came back with my camera (approximately one minute later.