As a kid we had raccoons regularly get into our hens. At first it was due to just one bar on the doors, then the next time was thru the screens on the windows. We learned over the years, but still, raccoons are no joke. My dad still remembers as a kid watching them on either side of a garbage can working the lid of. Smart ass critters. I had to dispatch a family of them that were terrorizing my chickens about 5 years ago.