Groundhog Day is here, when those in the U.S. look to Punxatawny Phil and Co. to project the fate of winter. True, it hasn't always worked out. But before you scoff at the weather-predicting power of a small rodent and its shadow, consider a few things.
1. It's likely well rested
A groundhog goes into true hibernation each winter. It'll build up its fat reserves and then hunker down, dropping its heart rate and body temperature for long stretches along the way.