These Pacific cephalopods illustrate the wide diversity among this group of mollusks. You can learn about a relative, the giant squid ( Architeuthis dux ), in our Giant Squid section.
An octopus shoots ink in defense as it swims away from a scuba diver.
Dr. Clyde Roper, squid expert, explains how he developed a passionate interest in the giant squid ( Architeuthis dux) in this excerpt of "Eyeball to Eyeball," an episode of Errol Morris' First Person...
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