A recent scientific discovery claims that giant sea lizards with “angry eyebrows” roamed the waters over what has become North Dakota more than 80 million years ago. The new species has been dubbed ...

A reconstruction of two Jǫrmungandr walhallaensis mosasaurs fighting. The sea lizards with "angry eyebrows" swam in ancient North Dakota and were named after a Norse sea creature and Walhalla where ...

A team of researchers has identified a new species of mosasaur, an extinct aquatic reptile that dominated the oceans during the late Cretaceous period. This discovery, named Jormungander walhallaensi ...