PlesiosaurusSchleich 15016 Plesiosaurus. The Plesiosaurus was a prehistoric reptile that lived in the sea and fed mainly on fish. It wasn't just its long neck that made this dinosaur stand out, but its swimming style: instead of using its paddle shaped fins to row, it moved forward by beating them like wings just like a sea turtle. Approx: 16 x 13 x 3cm(LWH) Suitable for ages 3+. Made from PVC, painted with non toxic acrylic paints.