The ocean is full of bizarre and terrifying predators, but few are as adept in their hunt as the bobbit worm. Check out the video to see this ruthless killer in action.

In a realm where not a single glimmer of light is available to live by, the Atolla jellyfish has found a way to defeat predators lurking in the dark.

Symbiotic relationships abound on the Earth, many examples of which are easily seen on coral reefs and other shallow marine habitats. This video gives us a look at the three main types of symbiosis: mutualism, commensalism, and parasitism.

Sharks are some of the ocean’s oldest and most fascinating predators — check out these 5 facts about hammerhead sharks!

If you come into accidental contact with fire coral, you’ll surely regret it. But these organisms are some of the most fascinating creatures in the sea, starting with the fact that they are not corals at all!

Many of us are very familiar with pelagic and reef species of marine life, but what spends its entire existence on the seabed can be even more interesting than what meets the eye!

Many people think of algae as the gross, slimy layer on top of a water body during warmer seasons, but algae is one of the Earth’s most important organisms. Here are just 3 of the most common types of marine algae.

Eels and sea snakes are strikingly similar animals when viewed underwater, but the differences between them couldn’t separate them further from each other, once you get to know them.