I'm glad I saw this topic. I have a similar feeder which I think was made for horses. I was concerned my girls would get their head stuck in there sometime because the vertical openings start out wide and get narrower at the bottom. I'm going to take it out tomorrow after reading this. The lady in Missouri where I bought 2 doelings a couple weeks back had a pretty good idea for a hay feeder that I think I'll try now. She took about a 5 foot long section of chain-link fence, wrapped the ends together and hung them from the rafter in her barn. This makes a U shape with the ends tied together at the top and she stuffed the hay inside. Clip the sides together and you have a hanging feeder with nice size openings, you just have to remove the stems every so often of course.