Hello, I have owned a pair of Redfoot torts for over ten years. I am unsure of the sex of them, however, as least one of them must be female. Over the past two years I have found a number of eggs in their enclosures (outdoor in summer, indoor in winter as we live in northern Ohio). We tried at first to incubate the first few, but they all proved to be infertile. The eggs are becoming increasingly thick and very hard; so hard in fact that no baby tort could ever break through if they happen to be fertile. Just last night I found another egg in the enclosure that was obviously very, very hard. I broke it open (with considerable effort) and was shocked to see just how thick the shell was formed. What could be causing this and is it dangerous to my torts? Egg bound like a chicken could get? Would appreciate advice. Just as an aside, I soaked them separately in a bath of warm water recently. I do not do it often - maybe I should?