(CNN) - Most kids end the summer with nothing more than a suntan to show for it. But, four kids in Iowa have something big to show for their vacation.
They found a 20,000-year-old mastodon tooth tucked behind a stretch of trees next to a creek in the northeast region of the state.
"It was hot and we were bored so... and we wanted to explore it cause we've explored it down that way and down this way," said Brylie Volker.
"I saw something flip over and picked it up and I realized it probably wasn't a rock, said Chase Redfern
"We ran up by the barn where all the adults were sitting and we said we found a tooth. They thought it was just a little mini rock. Like it wasn't going to be anything. And we come back with this enormous thing. It was pretty cool, Volker said.
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.
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