I'm pretty sure what it is, I have a barn cat and I've noticed more of her food is being eaten, right out of the bowl. So I put the bag into a feed bin with a lid. Next day, same as usual, all her food in her dish was gone. Ok...so next day, lid was off can and cat food all ate. Well took all cat food out of the barn, then the kid was off my layer mash and prints in the feed. I placed a box trap and I thought I blocked up the cat door, well I caught mamma cats 2 kittens... Any other ideas to try? I don't want it getting my birds, but I also have outdoor cats to consider as well.