Sea monsters made great mothers

Fossil plesiosaur had a baby on board

The fossil of a pregnant plesiosaur who died 78 million years ago indicates that the ancient sea monsters were surprisingly like today’s marine mammals.

IT’S A LIVE (PLESIOSAUR) An artist’s representation depicts the Mesozoic plesiosaur Polycotylus latippinus delivering a single live offspring, much like today’s marine mammals.