Body temperatures were recorded earlier from raccoons tethered outdoors in extreme cold. There was no suppression in body temperature. Later, two events suggested a new study, this time on heart rates: (1) the development of implantable radio-capsules for heart rate and EKG, and (2) the information that bears develop a bradycardia in the winter den, slowing sleeping heart rates from 40 b/m to 8-15 b/m. Three raccoons were studied periodically in outdoor dens in midwinter with Iowa implanted radio-capsules. Unlike the bears, when the raccoons stayed indoors for several days due to severe weather, their sleeping heart rates went up, instead of down. The explanations may be: (1) they were yearling raccoons, and (2) the winter was unusually mild. The experiment will be repeated with older animals.
Proceedings of the Iowa Academy of Science
©1968 Iowa Academy of Science, Inc.
Folk, G. Edgar Jr.; Coady, Karen B.; and Folk, Mary A.
"Physiological Observations on Raccoons in Winter,"
Proceedings of the Iowa Academy of Science, 75(1), 301-305.
Available at: https://scholarworks.uni.edu/pias/vol75/iss1/41