![Sloths may be threatened by climate change, human sprawl after 64 million years of evolution](https://ic-cdn.flipboard.com/cbsnewsstatic.com/bf68e31338c02feb884e775030620c3da398650c/_xlarge.jpeg)
Sloths, the world's slowest mammals, have evolved over 64 million years into a species that thrives throughout Central America and northern South …
Author: By Aliza Chasan
* VIEW the article originally published here.
** MORE curations: Al Cannistra at San Antonio ONE here.