AFP/Getty Images

Jose Antonio Nievas was out for a stream-side walk on Christmas Day when he stumbled across a shell that looks straight out of Jurassic Park.

After partially digging it out of the mud, the Argentine rushed home to tell his family about his discovery. “At first I thought it was a rock or a car tire,” he told Argentine newspaper La Nacion.

“When he came back he said, ‘Hey, I just found an egg that looks like it came from a dinosaur,’” his wife, Reina Coronel, told the news agency AFP. “We all laughed because we thought it was a joke.”

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But was it?

Argentine paleontologists say it's probably the shell of a glyptodont, a giant prehistoric armadillo that might have looked something like this:

“There is no doubt that it looks like a glyptodont,” Alejandro Kramarz, a paleontologist with Argentina’s Bernadino Rivadavia Natural Sciences Museum, told AFP. “The animal became extinct thousands of years ago and it is very common to find their fossils in this region.”

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The prehistoric mammals had big round shells and were believed to weight up to a ton.

Kramarz said he believes the shell could be 10,000 years old.