It needs to be pointed out that these are not underpass pigeons but Band-Tailed pigeons. One of the wildest most fascinating birds including waterfowl. Hunting season and bag limits are short and small and very few people recognize the difference between them and common or feral pigeons we see on city statues.
Nevada just sent an e mailed podcast about them today-starting a research program on them. Wonderful, fascinating bird, a trophy pigeon, I think it is awesome that you have them on a feeder