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. 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 DEEP SEA HUB: https://naturalworldfacts.com/deep-sea-hub/ Footage used is from YouTube, MBARI, OceanX, NatGeo, the Ocean Exploration Institute and the Schmidt Ocean Institute. Music Used: Light by Jorge Mendez AfterInfinity - Science and Medicine Dreams Become Real by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/by/4.0/ Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1500027 Artist: http://incompetech.com/ A Whisper by ann annie Echoes of Time by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/by/4.0/ Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1300029 Artist: http://incompetech.com/ Transcend by Audionautix is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/by/4.0/ Artist: http://audionautix.com/ #deepsea #wildlife #nature #documentary #ocean #marinebiology #science #biology Resources: https://www.nationalgeographic.com/animals/invertebrates/group/octopus-facts/ https://ocean.si.edu/ocean-life/invertebrates/cephalopods Dipper, F. (2016). The Marine World: A Natural History of Ocean Life. United Kingdom: Princeton University Press.