My chickens have a regular feed feeder that holds lots of feed but I never fill it up too much or to the top at least, has all the little "slats" where the feed comes out. My chickens seem to fling out alot of the feed somehow, and after a long rain today I go out and whats on the ground is of course wet, and also stinking. How do I keep them to keep the feed in? Do I need to lift it off the ground or what? I cant keep wasting feed, and having the smell.