Hello, this morning I found one of a pair of male guinea's hung from his hay rack. He had stuck his head into the hay rack and from what could be seen has got his bottom tooth stuck under a rung and had died attached to the rack. It was a horrible shock, I have used a hay rack for many years with no problems but after seeing what has happened I can see how they could be dangerous. I feel very responsible as I had put the hay rack in their cage and he was such a sweet guinea pig of 4years old and his brother is now left alone. Just wanted to warn other people to think about what is in the cage and if it could be a danger. I have now thrown away the rack.