Mice aren't the only animals to leave interesting tracks in the snow. Birds of prey often leave imprints of their wingtips when they strike. I think these tracks may have been from an owl. (Only the right side is shown in the picture, the left wing marks were mixed with a lot of small mammal tracks.)
I teach economics at Kalamazoo College. My wife is also an economist. We were on sabbatical in Europe for the 2014-15 academic year. (Salamanca, Spain, followed by Oxford, UK.) We were in Uruguay for the 2006-7 academic year.