Mastodons -- elephant-like beasts that lumbered across North America more than 10,000 years ago -- are long extinct, but apparently it wasn't tooth decay that did them in.
A 9-year-old Michigan boy stumbled across something -- literally -- that, it turns out, is a mastodon tooth.
Something killed them all off. I wonder what it could have been.
Climate changes. It just does. Sucks to be a mastodon.