Fossils found by workers digging a tunnel for a new railway line in Los Angeles have been identified as the remains of a giant ... and sloth probably lived about 11,000 to 40,000 years ago ...

For a long time, scientists believed the first humans to arrive in the Americas soon killed off these giant ground sloths through ... between 11,000 and 13,000 years ago. This date happens to ...

SAO PAULO (AP) — Sloths ... years ago. At New Mexico's White Sands, researchers have uncovered human footprints dated to between 21,000 and 23,000 years ago, as well as similar-aged tracks of ...