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Fig. 2. Body temperature measured by calibrated thermography of a shaved spot on
the scalp directly over the brain. This method agreed with cloacal temperature
within <1°C and avoided the restraint and increased wetting of the down
associated with the use of cloacal thermocouples. Body temperature decreased
as water temperature decreased to
15°C, and then stabilized. The line
is a LOWESS smoother (Cleveland,
1985) showing the trend.