A fossilized 78 million year old seagoing animal was about to give birth when it died, according to paleontologists.  The animal, a species of plesiosaur called Polycotylus latippinus, was first found by Charles Bonner on his Bonner Ranch in Logan County, Kansas in 1987, but wasn't thoroughly studied until recently as the fossil was being prepped for display in the Natural History Museum of Los Angeles County.  The sixteen foot long female was very much pregnant with a fully-formed baby inside her body.  The infant's remains were complete with no eggshell residue, which revealed that plesiosaurs gave birth to live young, as do whales and dolphins today instead of crawling up on a beach to lay eggs as turtles do.  Now we face a new question: If they birthed like modern sea mammals, isn't it possible that plesiosaus were mammals instead of reptiles?  Another prehistoric sea creature type, the ichtyosaurs, have already been shown to have borne live young, and they were suspiciously similar to modern dolphins in spite of still being classified as reptiles today.