An artist's drawing of a mosasaur attacking another mosasaur underwater. Scientists have named an ancient species of giant sea lizard with "angry eyebrows" and a stumpy tail after Jörmungandr, a sea ...

It’s a typical summer afternoon on Nantucket: day-trippers disembark from ferries, children line up for ice cream cones, and church bells peel in the sea breeze. But soon a 75-foot sea monster is ...