Mastodon

Mastodons or Mastodonts are elephants of the extinct genus "Mammut" and the family Mammutidae. Mastodons became extinct about 11,000 years ago. 
Mastodons, with mammoths, modern elephants and various older families, are members of the order Proboscidea. As adults they stood between 2.5 and 3 meters (8-10 feet) at the shoulder and weighed between 3500 and 5400 kilograms (4-6 tons). 
Mastodons were browsers on leaves and branches, as shown by their molar teeth.
Two species.
"M. americanum" was the American mastodon, and "M. pacificus" was the Pacific mastodon. They are the youngest and best-known species of the genus. Mastodons disappeared from North America as part of a mass extinction of most of the Pleistocene megafauna.
Recent discovery.
Stone tools and bones from a butchered mastodon were found at the bottom of a river in Florida. After a four-year investigation, researchers decided that humans lived there and made a meal of a mastodon 14,550 years ago.