Mollusks

While most female squid and octopuses have just one reproductive cycle before they die, vampire squid go through dozens of egg-making cycles in their lifetimes, a study found.

Antarctic octopuses survive subzero temperatures because of the blue pigments in their blood, a new study finds.

A dead giant squid has washed up on a beach at a nature reserve in New Zealand. A group of tourists was lucky enough to see the body up close.

A huge giant squid carcass cropped up in Cape Town.

Here's the science behind how oysters make pearls, and how they were valued historically.

Sea slug attack goes sour for hungry predator.

The mesmerizing footage was captured more than 4,500 feet below the sea surface.

Octopus mothers slam themselves against rocks and eat their own arms before their eggs hatch. Scientists have discovered what leads to the self-destruction.

Octopuses are one of the most successful camouflaging animals in the world. But exactly how they pull off their rapid, high-resolution color changes is still a mystery.

Squid, octopus, and other cephalopods are genetic rulebreakers who have scrambled their genomes, perhaps allowing them to evolve their impressive smarts.