opher Goo says there are six species of moles in North America, and three of these may occur in your yard (Eastern Mole, Hairy-tailed Mole, and Star-nosed Mole). Of these, the Eastern Mole (Scalopus aquaticus) is most common in Ohio. Moles are about the size of chipmunks (6-8 inches in length) and can weigh three to six ounces. Each year a mole can have one litter of two to six young, depending on the health of the female. Gestation lasts about five to six weeks, which means that you can expect litters anywhere from mid-April through May. Believe it or not, young moles have less than a 50% chance of surviving long enough to reproduce