In the mid 1960s, scientistss investigating rustic South Dakota uncovered the fossilized leg bone of a Hesperornis: a substantial amphibian winged animal rather like a penguin, which lived amid the dinosaur time.

At first look the fossil looked unremarkable. It assumed control a large portion of a century for researchers to perceive the bone's actual noteworthiness.

This Hesperornis had survived a keep running in with a plesiosaur: a marine reptile bigger than an individual. It is just the second fossil found to date that hints at being assaulted by a plesiosaur.