On Australia's Ningaloo Reef, researchers and Australia’s richest man are using environmental DNA to unlock the mysteries of the world's biggest fish.

Ocean warming puts fish are at risk of becoming smaller due to the lower oxygen content of warm water, reports a new study.

Sea lions use their whiskers in “task-specific” ways, adjusting the specific way they’re moved depending on what they intend to discover about a particular object.

Dolphins aren't the only animals that use tools — octopuses and otters do too.

During the study that led to this revelation, researchers looked at shark remains found in the scat of the leopard seals as well as visible signs of struggle on the seals’ bodies.

*Belize Aggressor IV's* 24 dives in six days explore a newly minted shark sanctuary with worldwide implications.

The light of the moon can shape hunting, mating and more in the ocean.