I have two northern blue tongue skinks, one is a normal and the other is a caramel. There behavoir towards one another has made me believe them to both be female. I keep them together in a huge 6 ft enclosure, well initially they had no interest in each other and rarelly ever saw one another due to the massive size of the cage. Over the past month I have noticed that my caramel northern, Toby (Toblernone) no longer wants to burrow, she just sits around all the time. She is pounding down food and starting to gain weight rapidly especially in her belly region. She is sucking down water, alot more than she usually does, and does not want to be handled at all. If she does burrow she always keeps her head above the substrate. She is also seeking out my other skink, Sheila, and trying to stay close to her/him about every couple days she does this. They used to keep there distance from one another, not getting aggressive per say but just limiting contact. I have found both of them many times recently curled up with each other or laying ontop of each other. I am starting to wonder is Sheila is a male and has bred with Toby? She has put on almost 100 grams in two weeks and still gaining weight. They are the same age and unrelated, but toby's stomach area is double the size of sheilas. I know they typically gain weight in there tail first but this is not happening. Has anybody bred blue tongues before and seen any of these behavoirs or changes? Thanks:)