Marine animals can be fascinating and quite beautiful. However, you should not approach some of them. Certain fish and jellyfish are highly poisonous, and contact with them can sometimes be fatal.

Giant mosasaurs, once thought to be strictly ocean-dwelling predators, may have spent their final chapter prowling freshwater ...

Due to its vast size — stretching from Canada and Greenland in the north, to Mexico in the south — North America contains a vast range of habitats. From land to sea, there are forests, mountains, ...

Mosasaurs, giant marine reptiles that existed more than 66 million years ago, lived not only in the sea but also in rivers. This is shown by new research based on analyses of a mosasaur tooth found in ...

A surprising fossil find shows that some mosasaurs lived in ancient rivers as oceans changed near the end of the Cretaceous.

A common neurotoxin produced by algae blooms is making California sea lions more aggressive. Here’s why it has the power to change behavior—and the danger it poses. Rescuers capture a sick sea lion in ...