One of the oddest mammals on Earth is the easy-going, slow moving sloth. For Lucy Cooke, a National Geographic explorer, zoologist, writer, and filmmaker, sloths have been one of the loves of her life -- so much so that she founded the Sloth Appreciation Society. In 2010 she traveled to a sleepy corner of Costa Rica to Slothville, the world's first sloth orphanage. She made a short video about the sloths there which went viral within a few days. That led to a documentary for Animal Planet entitled "Too Cute!