74-mn-yr-old fossil reveals giant sea reptile battle
A 74 million-year-old fossil discovered in Canada reveals a battle between two giant sea reptiles called Mosasaurs. The skull of the 6.5 metre-long reptile had a large hole with an embedded broken tooth, that was found to belong to another Mosasaur. Researchers believe the fossil record points to mating behaviour or male competition and not a predatory attack.