It's the largest reptile egg ever discovered, and the creature who laid it was at least 200 feet long.

The largest reptile egg in recorded history has officially been discovered in Antarctica. The football-sized specimen is the first known fossilized soft-shell egg ever found on the continent, and is believed to have been laid by an extinct sea lizard around 66 million years ago.

Published in the journal Nature , the research indicates a giant marine reptile known as a mosasaur most likely laid this egg. For lead author and postdoctoral researcher at the University of Texas Austin’s School of Geosciences, Lucas Legendre, the discovery is remarkable in several significant ways.

“It is from an animal the size of a large dinosaur, but it is completely unlike a dinosaur egg,” said Legend

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