It must be that time of the year when the birdies let others share their food supply. nuthatches ( photo / image / picture from Kildale's Garden ) The pileated makes use of the long board that I used on this feeder. pileated ( photo / image / picture from Kildale's Garden )
The adult birds are glad to have an easy food source for themselves when they're rearing their young. As you say they don't seem to mind sharing unlike winter when there seems to be far more squabbling around the feeders.