Twenty-two years after John Hammond’s ill-fated attempt to open a dinosaur theme park, the world finally got its first look at a functioning park filled with prehistoric creatures and thousands ...

A line drawing of a mosasaur upper jaw is superimposed to show the details of the eighth detectable bite on the ammonite. Image from Kauffman and Kesling, 1960.

Mosasaurs, ancient marine ... A line drawing of the mosasaur Platecarpus coryphaeus made by Samuel W. Williston and published in 1898 as part of Volume IV of the University Geological Survey of ...

A new species of mosasaur — Jormungandr walhallaensis — is unusual, displaying a mix of traits from other creatures of its kind. Challenging what’s known about these ancient giants, it could ...

Geologists have uncovered the fossil of a mosasaur, an ancient aquatic predator, in Mississippi. Often referred to as a “sea dragon” due to its imposing size and fearsome appearance, this ...

Mosasaurs Gave Birth to Live Young. Everhart estimates that a 50-foot mosasaur would have weighed around 5000 kg (5.5 tons). Something that big would have really struggled to pull itself ashore to ...

Some mosasaurs measured just a few feet long, while the largest — in the genus Mosasaurus — was nearly 60 feet (18.2 meters) long, and while mosasaur fossils are relatively plentiful ...