
Cephalopods—ocean-dwelling mollusks such as the octopus, squid, cuttlefish, and Nautilus—are ancient and complex creatures. They evoke our primal fascination with mysterious creatures of the sea, with weird and wonderful features like prehensile arms that can regenerate when amputated, huge, vertebrate-like eyes, jet-propulsion systems to help swim by squirting water, and special organs to change skin [...]