Pregnant sea monster

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.
The aquatic, carnivorous reptiles gave birth to live young, scientists report August 12 in Science. And they probably birthed just one plesio-baby at a time one very big baby, estimated to be more than 40 percent of the mother's body length at birth. Putting so much effort into a single offspring suggests that like today's marine mammals, plesiosaurs offered a bit of postnatal maternal care.

Source: Live Science.