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On answer #1 I would disagree while adding that it may depend on how close in proximity the cages are. My roseas share an overall enclosure but are separated completely by a piece of solid Lexan. Essentially it's a completely separate system, albeit extremely close to the other. They can definitely sense each others movements, though probably not through chemical sensors or otherwise.
On #2 I do agree and would even throw in defensive. It's the only time my rose has ever flicked hairs.
Thanks, guys. I was particularly wondering about #2 because my P. parvula that I've had for a week (and that is supposed to be very docile) has been the exact opposite with me...today I was refilling the water dish and when I stuck my hand in the cage she charged me! Hungry, perhaps? I'll be feeding her tomorrow so hopefully she'll settle down with some crickets inside her.