There are no guarantees some Gus jut don't hibernate. In some cases climate and where you live may have something to do with it and in other cases it doesn't. If the tegu decides its going to hibernate it's going to do so. Some people try to change it one way or the other if they don't want the Gu to hibernate. If they live in a cold climate they up the temps in the enclosure and extend lighting times. While people that want their Gus to hibernate do just the opposite. Sometimes it works and other times it doesn't. I'm in Vegas and my 2 1/2 yr old Gu Dino has never hibernated a day in his life. He slows down (more of a burmate) during winter but thats about it. He's producing sperm plugs now so does that mean that he's infertile? I doubt it, but there's only one way to find out. Find a female that has never hibernated and breed them. I didn't buy him to breed so I'm not sure if I want to do that though. Although I might,..just to try it and see if its true or not.
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