The Unique Biology of Cephalopods | Nature World Explore

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Cephalopods exhibit some incredible features. Out of all 8,000 living species of marine invertebrates in the oceans, by far the largest, most deadly and most intelligent are the cephalopods. A class of highly developed mollusks that includes octopuses, squid, cuttlefish and the mysterious nautilus. Their graceful fluid movements, vibrant colour changes and complex brains make them one of the most peculiar and important groups of organisms in our oceans. The largest - the giant squid - measures longer than a school bus, while the smallest could sit atop your finger. Let’s take a closer look at these diverse and often alien-looking invertebrates.