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The Unique Biology of Cephalopods

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.

2021-03-16 19:00:00 - Natural World Facts

 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.


00:00 - An Introduction to Cephalopods

00:48 - The Diversity of Cephalopods

01:12 - The Structure of Cephalopods

01:50 - The Intelligence of Octopuses

02:34 - The Unique Appendages of Squid

03:05 - Bioluminescence in Cephalopods

03:26 - Adaptations of the Firefly Squid

03:59 - How Cephalopods Change Colour

04:56 - Mimicry in the Mimic Octopus Explained

05:38 - Courtship in Cuttlefish

05:52 - The Unique Anatomy of the Nautilus

06:27 - Deep Sea Gigantism in Cephalopods

06:44 - The Creepy Magnapinna Squid (Bigfin Squid)

07:42 - Gigantism in the Humboldt Squid

07:56 - Gigantism in the Giant Squid

08:25 - The Role of Cephalopods in the Ecosystem

09:20 - Conclusion

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