Four Iowa kids exploring a cool creek found a 20,000-year-old mastodon tooth turned upside-down like a rock beneath the water.
The five-pound (2.5 kilo) tooth is still attached to the huge roots.
Professors say because of the good condition of the tooth, there could be even more remains from the Ice Age animal in this same creek where the tooth was found in the northeast region of the state.
(WATCH the video below, or READ the story from Iowa’s WPTV)