A tooth from the now-extinct mastodon was found in a Michigan charity's donation box during a July pickup in Grand Rapids.
"At first, it looked like broken parts of something," said Jay Starkey, director of In The Image, a Christian charity that distributes donated clothing and similar items to low-income residents, MLive reported.
The fragmented tooth could be anywhere from 12,000 to 15,000 years old and will be donated to the Grand Rapid Public Museum, which is formally adding the artifacts to its educational collection this month, MLive said.
Volunteers also found a tusk that is believed to be from a mastodon as well.
"It's pretty amazing the things we get," Mr. Jay Starkey told Fox News. "I just looked at it and said, 'This is something different.'"
The animals, related to the elephant, roamed North America more than 10,000 years ago and their remains occasionally turn up in Michigan, Fox News said.
Starkey said the discovery made the long list of odd things the charity has received, from an urn filled with someone's ashes to framed divorce papers.
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