While out on a stroll along a stream to the south of Buenos Aires, Argentina, Jose Antonio Nievas spotted something peculiar sticking out of a riverbank. The object was greenish and pebbly, and at first Nievas thought he had discovered an enormous dinosaur egg. He was wrong.
After popping out for some fresh air, farmer Jose Antonio Nievas stumbled across what experts believe are the remains of a prehistoric giant.
With a little more excavation, the unusual find turned out to be something much more recent: a nearly complete, metre-long shell of a beast that trundled around South America over 10,000 years ago!