Did you search for "chicken feeder cover"?I've spent a couple hours googling and looking for a decent DIY solution to this problem. There's got to be something cheap and readily available that I can use to keep the girls off the top of the 5 gallon bucket I'm using for their feeder. I've done a cursory search of the forums here as well but I'm apparently not using the right combination of search terms.
Google offers me lots of things like this:
https://www.jefferspet.com/products/11-lb-poultry-feeder-cover-for-the-11-lb-poultry-feeder-m3-pb
Basically just cone-shaped things, often with a hole in the middle.
There's plastic ones and metal ones, in various sizes. They often attach to the top of the feeder in a way that lets them wobble, so a chicken trying to perch will get dumped off.