 Rhodes, Steggy the "Stegosaurus" and Amelia the "Quetzalcoatlus", and a garden that mimics the landscape of the northeastern United States during the Ice Age, with tundra vegetation, polished gravel, and glacial erratic boulders.The Hyde Park mastodon was discovered in 1999 when a local family noticed some unusual-looking logs during a pond excavation of their backyard in suburban Hyde Park, New York.Upon further investigation, they were identified as the bones of an American mastodon ("Mammut americanum").