An American mastodon (Mammut americanum) skeleton considered the most complete among those found since the 1940s was discovered in the region called the Thumb in Michigan, USA. A four-day excavation at the Fowler Center for Outdoor Learning, near the city of Mayville, conducted by a team led by the University of Michigan with a number of volunteers made it possible to dig up about 75% of the specimen’s complete or nearly complete bones.