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If I had to guess, I think that tail curling is something chameleons do when they're uncomfortable. Like, how most of us wouldn't want our feet handing off the end of the bed, or have our arms dangling over the side just because it doesn't feel as safe (lest the boogeyman gets you!), I feel that chameleons curl up their tail because they wouldn't want a predator coming up along a branch and getting them by it.
Notice too that chameleons curl their tails when they flare up at us or at males, to make themselves look bigger, but it also springs from being afraid or uncomfortable. A chameleon that doesn't feel threatened will not curl up their tail when they're on your arm or in a free range.
So I think that not curling their tail is nothing to worry about. As long as the animal is healthy, the tail isn't discolored or injured, it's not something to worry about. Mine will sleep with their curls along the branch they are on too occasionally.
The tail curling is a defense mechanism when the Cham feels threatened. It makes them appear larger to a predator. This is one of the reasons they normally sleep with a curled tail...it's not that he's uncomfortable or currently feeling threatened, he's just being proactive to a threat as opposed to reactive...
If your Cham is showing his relaxed colors while sleeping, I'd say he's fine. Maybe he's so fine and relaxed that he doesn't feel the need to curl up at night...Maybe you're too sweet to your little guy!!!
Greg
Really? Even with relaxed colors?
Kuzco and Pascal have this think where they wrap their tails around my wrist , but then climb to my chest and curl up their tail and go to sleep. I always thought it meant they were relaxed.. now I feel bad lol