I believe wild birds are one of the worst carriers of internal parasites, mites & lice. I use hanging or trough feeders for my chickens & these are an oasis of food for wild birds which enjoy pillaging & crapping in them. Most of the covered feeders I've seen with a low, acceptably large overhead lip over the feed trough are 50# feeders & I don't need anything that large. If anyone can make a suggestion I would sure appreciate it. My only other alternative is to build a mobile roofed frame for feed areas. Even then the little flying troublemakers will find their way to the feed.