A 68 million-year-old egg the size of a football — the largest soft-shelled egg on record and the second largest egg ever discovered — might belong to a mosasaur, a reptilian sea monster that lived during the age of dinosaurs in what is now Antarctica, a new study finds.

If true, this would be the only mosasaur egg on record, according to the study, published online yesterday (June 17) in the journal Nature



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