You wouldn’t be alone if you thought the octopus and squid were the same animals. They are cousins—both part of the group cephalopoda—a group of marine mollusks that include squid, octopus, nautilus, and snails. These animals are all characterized by symmetrical bodies, no vertebrae, prominent heads, and arms or tentacles that extend from their bodies. … Continue reading What’s the Difference? Octopus vs. Squid