![]() The largest-the giant squid-measures longer than a school bus, while the smallest ones-like the pygmy squid and California lilliput octopus-could sit on the tip of your finger. ![]() Early in their evolution, cephalopods relied on the sturdy protection of shells, but over time many eventually lost the outer shell and instead relied on new adaptations like heightened intelligence, a talent for hiding, and strong, flexible arms. A highly intelligent group of ocean dwelling creatures, the living cephalopods include the eight-armed octopuses, the ten-armed squids and cuttlefishes, and the shelled chambered nautiluses.
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