It enters its nest in October (some adults retire much earlier), rolls into a stiff ball, and decreases its respiration from between 100 and 200 breaths per minute to one breath about every five minutes.
In October, it retreats to its nest (with some adults leaving even sooner), forming a stiff ball, and decreases its respiratory rate from approximately 100 to 200 breaths per minute down to one breath every five minutes.