The American genetic engineering firm Colossal Biosciences recently announced to much fanfare it had "de-extincted" the dire ...

Nearly 27,000 years ago, a giant ground sloth traveled across a barren, arid landscape in what is now Belize, munching on grassy vegetation and searching for water. A nearby sinkhole may have ...

By Jeanne Timmons Ground sloths emerged in South America tens of million years ago, eventually ranging as far north as Canada. While their modern relatives dwell in trees and top out at the size ...