Lack of preferred vegetation is definitely part of the reason they choose the feeder. They are also getting old, fat, lazy, and easy is now their default. Most are in the 30", 20-25 pound class, they can be disruptive. We have stocked 9000 CNBG, 4-6" in the last 24 months so GC eating premium feed is not acceptable...Lake management is expensive, no simple answers.