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**EMBARGO: No electronic distribution, Web posting or street sales before TUESDAY 3:01 A.M. ET FEB. 1, 2022. No exceptions for any reasons. EMBARGO set by source.** A groundhog at the 65-acre Gilsland Farm Audubon Center, where Christine Maher, a behavioral ecologist, has tagged no fewer than 513 of them and is one of the few scientists to study their behavior, in Falmouth, Maine, Sept. 23, 2021. New research aims to shed light on the social habits of the popular, but often misunderstood, animal. (Greta Rybus/The New York Times/Fotoarena)
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