"Sloths spend most of their lives in trees, and until recently scientists didn't know very much about them. But Dr. Rebecca Cliffe was determined to discover their secrets. To find out more, she fitted sloths with special backpacks containing a device to track their activity. She learned how to climb trees in the Costa Rican jungle so she could take sloth hair samples and test their DNA. And she's helped create sloth crossings and plant trees to ensure the sloths aren't trapped in shrinking territories. Along the way, she earned the nickname Dr. Sloth." -- Amazon.