In Earth’s deepest waters, survival depends on aggression, stealth, and biology built for killing in darkness. This video ...

During a dive off Argentina, scientists documented a rare jellyfish discovered a little over a century ago and seldom seen since, as well as the fish that keep it company.

Scientists filmed a squid covering itself in mud and holding its tentacles upright, using camouflage that helps it hide on the ocean floor.

The deep sea is famous for strange and terrifying creatures, but some rivers may be even more dangerous. Freshwater systems ...

Sharks are often imagined as massive, powerful predators cruising through open water, but not all sharks are great ...

Evolution sounds like a straight climb toward better survival, but fossil records and genetic research show species sometimes ...

Megalodon usually gets all the attention when it comes to sea monsters, but ancient oceans were full of predators just as ...

Scientists have recently discovered a newly-recognized threat within the deep sea: marine darkwave. Learn all about this ...

Humans are making the world’s wildlife dangerously 'samey'. Some scientists have a word for this reshuffling of life: the ...

Photographers capture mutant crayfish, cleaning fish, and synchronized whales in this year's top underwater contests.

Now, a breakthrough by Chinese researchers has filled this gap by discovering a top-tier soft-bodied fossil deposit in Hunan ...

Gray wolves are hunting sea otters. Scientists are studying how land predators adapt to ocean hunting and what this means for ecosystems.