Well, here we go again. My solution to this problem is the same as for wild bird problems. Use a treadle feeder. Look 'em up. I build my own and as long as the varmint is lighter than the chickens I'm feeding, they can't get to the feed. Look 'em up. Lots of plans around. They won't work for chicks but as soon as my pullets go from the brooder to the pullet pen they have a treadle feeder. Regards, Woody