Figure 3. Data collected in a C. medius Studied in a Nest Box in the Wild in Madagascar With Continuous Torpor Verified by Metabolic Rate.

The gray shading indicates periods of darkness. a. Ambient Temperature and Metabolic Rate vs Time of Day in Hours. b. State scored for each 30 seconds during the period of monitoring (it was either a monotonous ultra-low voltage state, a REM-like state, or brief periods of movement which obscured making a state determination designated as “movement” epochs) vs Metabolic Rate vs Time of Day in Hours. c. Rapid eye movements (REMs) per 30 second epoch and Metabolic Rate vs. time in hours. c. Beta power (16.5–30 Hz) per 30 second epoch and Metabolic Rate vs. time in hours d. Delta power (0.5–3.5 Hz) per 30 second epoch and Metabolic Rate vs. time in hours. For reference, the mean basal metabolic rate of resting lemurs that are not in torpor in the field is 133 ml O2/h. This is based on the mean of data collected from 14 post-absorptive resting lemurs while awake. The lowest basal metabolic rates we measured in non-hibernating lemurs were ≥115 ml O2/hr²⁶.