We invested in a couple galvanized chicken treadle feeders -- not the kind that lift up to open but the kind that push inward into the feeder when they open -- I worry the lift-up lid models can come down on a chicken's neck but the inward opening model just pushes the chicken's head back out without falling on top of the head. Treadle feeders work by a chicken stepping on the bottom foot treadle and the feed door opens into the feed bin. A lightweight predator like pigeons, wild birds, rats, lizards, mice, are not heavy enough to activate the foot treadle. Treadle feeders from any manufacturer are not cheap but we had to choose what chicken expense was important to us. Some people make their own but what a pain to assemble - even the DIY models so we bought ours already assembled from ChickenCondos.com!
Those look sweet. I'm starting on a project to expand the run area so even more space for the moochers to get in. I'll be looking into these! Thanks for sharing Sylvester!