BTW...Out of those two, I introduced the new one a few days ago when I found it sun bathing. When I put it in, the existing one was chasing the new one around for several hours. The next day, they started to adapt to each other. Yesterday, they started to sun bath next to each other. And today, one is laying on top of the other. I am not sure if that is copulation or they are just trying to keep warm.
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I will be back!