If groundhogs don't stick their heads up every February 2nd to see if its Spring, why do they do it? To find a mate.
In the study, the first groundhogs to come above ground are all males all looking for female groundhogs. It's usually cold in Pennsylvania in February so groundhogs mark territory, mate, and go back into hibernation. Weeks later, groundhogs wake up when it warm and reconnect with the female.
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