My daughter accidentally let the chickens out and when I put them back I noticed they have huge lumps on their chests. Both of them have it and its never been there before, so I'm thinking full crop? They've never really been out for that long before so I'm guessing they ate tons of stuff. Do I need to give them extra grit or will they be ok with what they picked up on the ground? If it not something simple like a full crop, what do I do? Or do I need to do anything at all?