A popular social-media video shows a rare phenomenon—an octopus riding a shark. Even the experts were shocked.

A group of friends came across an octopus in Washington, and they were delighted. Their joy in this viral video is infectious.

Watch (and listen) as an octopus squishes itself into a tiny wet hole in the sand. It’s as impressive to watch as it is gross to hear.

Scientists aboard the exploration vehicle Nautilus went giddy when they spotted a rare and undeniably cute deep-sea creature: a dumbo octopus.

A new study discusses group-hunting behavior among octopuses and fishes. There’s also the fact that octopuses punch fish that don’t behave.

If you had to put your money on one of these formidable ocean predators in an octopus vs. shark battle, which one are you betting on?

A SCUBA diver got more than she bargained for when she spotted a giant Pacific octopus and it gave her a full face hug. Watch it here.

Have you heard of the real-life Octopus Garden? Learn more about the largest-known aggregation of octopuses in the world.

Watch the incredible moment an octopus changes color from stark white to bright orange-y red, caught on film in the U.K.

It’s not every day that a giant Pacific octopus comes up and hugs your leg. That happened to this lady though. Watch it here.