Apparently, these marmots are also called 'whistle pigs'.....I wonder why!

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When hibernating yellow-bellied marmots emerge in spring, they are the same age, biologically speaking, as when they first curled up in their dens eight months ago. The new study, published last month in Nature Ecology and Evolution, could help scientists find the key to slowing the aging process in humans.
The marmots' anti-aging abilities may be linked to metabolic changes in their bodies that occur as they undergo deep hibernation.

National Geographic