Andrea Marshall studies manta rays and works to protect these intelligent ocean giants from population decline.

The ocean is home to animals so enormous that some can outweigh entire groups ...

Add Yahoo as a preferred source to see more of our stories on Google. The video explores the world's largest ocean creatures, including blue and fin whales, whale sharks, giant and colossal squids, ...

The ocean is home to some of the most awe-inspiring creatures on Earth, many of which dwarf anything found on land. From massive whales to elusive deep-sea dwellers, these giants of the sea ...

Add Yahoo as a preferred source to see more of our stories on Google. The oceans have produced some of the largest animals ever to exist, from prehistoric predators that dominated ancient seas to ...

For centuries, massive teeth washing ashore left people wondering what kind of monster once ruled the seas. Those teeth belonged to the megalodon, the largest shark to ever exist. In this video, ...