I was checking on my girls and giving them a trim and clean around the vent last night. There are 17 hens and I was able to work on about 10 of them. I noticed there was variation in the shape and size of their vents. None of them had an extrusion so I feel comfortable saying there were no prolapses. Some of them had vents that were about the size of a nickel in diameter with a healthy pink color on the fleshy bit inside the vent area. A couple had vents that were much larger. I didn't exactly measure but a good guess would be 1 1/2 inches in diameter. Again the flesh inside was a pretty peachy pink color. Is there an available reference link to pictures on vents that are currently laying vs. non-laying hens vs. sick hens? Or maybe a book that I can get as a guide? Thanks for your help.