Fast asleep to wide awake -- hibernating bears, predation and pregnancy

Black bears hibernate, sleeping their way through winter, and who can blame them? But science is only just beginning to understand the physiological changes that allow bears to re-emerge in spring without much muscle and bone loss, and how they escape from danger during the colder months. New research published in BioMed Central's open access journal BMC Physiology used cardiac monitors and radio collars to measure the year round changes in heart rate and activity of wild black bears.

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