We have two beige chinchillas, one **** beige one hetero beige. Our **** beige chin Travis does a really strange behaviour. Quite regularly he sits and tilts his head round (either to his right or left). Once his head reaches round to a certain point his head quickly jolts back to the starting position. Then he just repeats this process until he decides to stop. He's almost unresponsive to any audio or visual stimulation when this happens. There doesn't seem to be any real pattern when he does this.