My Luna is awesome. She is very calm but a bit head shy. Never seen her ball up, but she will tuck her head if something approaches from above or too quickly. Short of that, she eats like a little pig, and as soon as 6pm rolls around she has her head out of her hide watching us eat dinner, and hoping a little rat will make it's way into her strike-zone. She has never bitten me, but I take extra care when I remove her from her hide, because she will head-track and tongue flick at ANY movement. Once she's out of her cage though she cruises around in your hands and tries to nose her way in between my arm and my body where its dark and warm lol.