GRANITE FALLS — A Minnesota hunter is celebrating a rare find following a weekend trip to Granite Falls. Chase Mortenson of Madison was hunting on his uncle’s farm on Sunday when he bagged a buck with three antlers growing from its head. The rare “unicorn buck” had a pair of normal antlers as well as a small outgrowth in the middle of its forehead. Mortenson shot at the deer and initially thought he’d missed, but says he found the buck about 20 yards away from his stand.