The giant sloth, or mylodon, was once thought to to have gone extinct long before humans arrived in South America. Some people now think that it may have been alive in the 1800s. You decide.
Please, please crowdfund this animated movie. It's called Giant Sloth, and it's got Paul Giamatti as a curator at a science museum that gets privatized, who starts hallucinating when he has a really bad day. It sounds kind of like Night at the Museum crossed with Eraserhead. Find out more on Kickstarter.
There are European cave paintings that are 30000 years old, but the art of the ancient Americas remains a mystery. This bone fragment features an engraving of either a mammoth or a mastodon, and is at least 13000 years old.