A huge fossil soft shell egg that measures 7 by 11 inches was discovered on Seymour Island, Antartica. The egg which resembles a deflated egg was found in rocks dating back 68 million years ago. It then sat in Chile’s National Museum of Natural History gathering dust as no one was able to identify it.
The fossil egg nick named "The Thing" not only has two distinctions as this excerpt explains: "The specimen is the first fossil egg found in Antarctica and pushes the limits of how big scientists thought soft-shell eggs could grow. Aside from its astounding size, the fossil is significant because scientists think it was laid by an extinct, giant marine reptile, such as a mosasaur — a discovery that challenges the prevailing thought that such creatures did not lay eggs."
Their reasoning behind suggesting the egg may have come from a mosasaur, an extinct giant aquatic lizard , is because the egg was found in an area where there are a lot of mosasaur bones.
However, it is popularly thought that dinosaurs laid hard shelled eggs as this excerpt explains: "Crocodiles and birds, dinosaurs’ closest relatives, lay hard-shelled eggs, so it had always been assumed that all dinosaurs did too, yet hard-shelled eggs are known for only three groups of dinosaurs — the hadrosaurs (“duck-billed” dinosaurs), sauropods (“brontosaurs”) and theropods, the group that includes living birds. And that presented some problems."
It is not yet clear yet which dinosaur laid "The Thing."