Pleistocene rewilding The mountain tapir is the only extant non-tropical species of tapir. Predators of mountain tapirs include cougars, bears, and, less commonly, jaguars. Good introduction areas might include forested ecosystems of the west and east coasts, and the more scrub-like or wetland ecosystem of the south. During the Pleistocene, large populations of Proboscideans lived in North America, such as the Columbian mammoth and the American mastodon. The mastodons all became extinct at the end of the Pleistocene era, as did the mammoths of North America. However, an extant relative of the mammoth is the Asian elephant. It now resides only in
Cerutti Mastodon site 300 other bone fragments. The remains of dire wolf, horse, camel, mammoth and ground sloth were also discovered at the site. Five cobbles displaying use-wear and impact marks were also recovered from the site in Bed E. The research team found cobbles and broken mastodon bones lying together at the site. Uranium-thorium dating of bones from the site estimates a dating of around 130,700 (±9,400) years ago for the Cerutti Mastodon site. The research team claims that the cobbles found at the site were used as hammerstones and anvils. The research team also claims that the mastodon bones show signs