Torpor is a well controlled thermoregulatory process and not, as previously thought, the result of switching off thermoregulation.[5] Marsupial torpor differs from non-marsupial mammalian (Eutherial) torpor in the characteristics of arousal. Eutherial arousal relies on a heat-producing brown adipose tissue as a mechanism to accelerate rewarming. The mechanism of marsupial arousal is unknown, but appears not to rely on brown adipose tissue.[6]