Yes, I've noticed Nitro doing that frequently. Especially when I set him on a bush or something outside. The first thing he does is take a couple licks.
yes, they all do that. I am not sure why or if anyone really knows. It is like they are testing it out. I should clarify the Panthers do it anyways. Usually when I set them on something new a branch, vine, they lick it!
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My own personal belief is that they leave scent marks on the branches from their cloaca and feet and can smell or taste themselves or others! My Male does it especially after a Female has been running all over His cage! I'm no expert but this is what I have witnessed and thought!