Why would a young tegus back legs twitch? Anytime he sits still his back legs twitch and he opens his mouth... I don't know how he was taken care of before I got him but it makes me think they didn't have a uv bulb for him. If that's the case what should I do. I've had him for a day or two and his has a uv bulb now, well it make him better or does he need to go the vet.