Image by @joelsartore | This yellow-bellied marmot is doing his part in helping biologists in the department of @csunaturalsciences at @coloradostateuniversity better understand hibernation, including bone metabolism and food intake regulation. While hibernating, these little creatures don’t eat for 6 whole months, and their body temperature drops to near freezing. Even the babies hibernate! For the first year they do so with their mothers. When they aren’t in hibernation, yellow-bellied marmots take care of one another by communicating using distinctive alarm calls, a different one for each kind of predator. They can be found in the valleys, meadows and foothills of the Rocky Mountains and the Sierra Nevada. Follow @joelsartore to see a video of this marmot!