Elementary school students in California accidentally find 11,500-year-old fossil. Left arm bone from a Jefferson sloth (Megalonyx jeffersonii) found in Santa Cruz Mountains.
Fossil is now being examined by the museum's fossil experts to determine its possible origin. The giant sloth owes its name to former US President Thomas Jefferson, who described its first discovery in Kentucky in 1796 in a letter to the American Philosophical Society. The museum is exhibiting the exhibit until May 26th.