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WikiPedia: Groundhog https://naturalhistory.si.edu/mna/image_info.cfm?s... https://web.archive.org/web/20180325073744/https:/... https://web.archive.org/web/20210308080134/https:/... https://www.biodiversitylibrary.org/page/726959 https://www.iucnredlist.org/species/42458/11518999... https://doi.org/10.2305%2FIUCN.UK.2016-3.RLTS.T424... https://www.biodiversitylibrary.org/bibliography/6... https://doi.org/10.5962%2Fbhl.title.61270 https://web.archive.org/web/20130224021837/http://... https://web.archive.org/web/20120311131559/http://...