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groundhogs

Jean-Sébastien Guénette / Flickr - http://michrad.io/1LXrdJM

The University of Michigan -- concerned about problems caused by burrowing groundhogs -- is using dry ice to suffocate the rodents in their dens beneath the school's North Campus.

The Ann Arbor News reports Thursday that officials say the burrowing could undermine the foundations of structures, porches and pavement.