The U.S. Fish and Wildlife Service finalized a rule that removes the requirement that shellfish have an external shell. Photo ...

Squid, cuttlefish, octopus and other cephalopods will now be included within the regulatory definition of shellfish.

Scientists set out to understand all the ways the animals use their eight appendages. It wasn’t easy. By Kate Golembiewski The eight arms of an octopus are right there in its name. But these ...