When they move on, other marine animals may take up residence in the ... (Learn about the peacock mantis shrimp with your kids.) Not all mantis shrimp boast these spectacular colors.

Styxosaurus was an elasmosaur, a long-necked variety of the marine reptiles called plesiosaurs. These sea monsters grew upwards of 40 feet (12 meters) long. About half that length was neck ...

Smaller cephalopods and fish were likely dietary staples, though small marine reptiles that visited the ocean depths may have fallen prey as well. Tusoteuthis moved via jet propulsion—it ...

Read this story and more in the June 2018 issue of National Geographic magazine ... as a proportion of their body mass than any other marine animal, researchers say: In one large population ...

Box jellies, also called sea wasps and marine stingers, live primarily in coastal waters off Northern Australia and throughout the Indo-Pacific. They are pale blue and transparent in color and get ...