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Fig. 7. An approximate model of the change in the critical threshold
Ta that triggers arousal (thermal cue for arousal; thick
dashed line) over the rest phase (daytime) in male N. geoffroyi.
Torpor is entered before or near dawn. Arousal and active rewarming of body
temperature (solid line) from torpor is predicted to occur if and when
Ta (thin dotted line) reaches the thermal cue for arousal.
Bats re-enter torpor in response to cooling of Ta. Torpid
bats arouse near dusk.