Megalonyx jeffersoni is an extinct species of giant ground sloth that lived during the Pleistocene epoch in North America. It was part of the family Megalonychidae and is known for its large size, with some individuals reaching up to 3 meters in length. This herbivorous mammal primarily fed on leaves, fruits, and other vegetation. The species was named in honor of Thomas Jefferson, who was not only the third President of the United States but also an early paleontologist. Fossils of Megalonyx jeffersoni have been found in various locations, providing valuable insights into the ecosystems of prehistoric North America.