August Wisconsin Mammals By best estimations there are about 72 resident mammal species in Wisconsin. Guesses on the Order with the most species? It's Rodentia with 26 species of squirrels, chipmunks, voles, and mice - plus the lemming, porcupine, beaver and pocket gopher. I recall Scott Craven, perhaps Wisconsin's most famous Wildlife Ecologist, once stating that the meadow vole is the most populous mammal in Wisconsin. I couldn't find anything to verify that but I believe him. He has, after all, ...Continue Reading →