Mrs. K is correct leaving food out draws in rodents, so they may be eating your feed as well. I still leave my birds food out like I said I have a bunny in the barn who's been eating the cracked corn for a month. He doesn't eat much lol. I was thinking about how you said your birds are eating alot and I wondered do you let them free range at all? I went back in some of the old posts, but I didn't see that you did. I ask because I buy a 50 lb bag of cracked corn for 11 birds .. (and the bunny).. and that will last me a month at least. Yes I feed my birds cracked corn daily - the food is not put up - but my birds free range so they find most of their food from foraging. They get treats like black berries, bread, turkey, meal worms, etc.. but I'm not going broke at all over it. I'm prob spending $25.00 a month on special treats AND cracked corn (50lbs cost about $9.00). Just happen to think about you over the past few days as I fed my birds.