Sloths were not always slow, fragile animals hanging quietly in trees. Millions of years ago, some species reached massive ...

In southern Brazil and northern Argentina, scientists have discovered massive underground tunnels stretching for hundreds of ...

Sloths, the world's slowest mammals, have evolved over 64 million years into a species that thrives throughout Central America and northern South America, but climate change and human sprawl could be ...

This is an updated version of a story first published on Sept. 24, 2023. The original video can be viewed here. The stopwatch has long been the symbol of 60 Minutes. But any measure of time is ...