Category Archives: Cephalopods

The Kraken Cometh

Deep-sea giant squid (Architeuthis) remain one of the ocean’s most charismatic zoological mysteries. While there are plenty of specimens in museums around the world, little is known about their behaviour. Only recently have fleeting glimpses been captured of these creatures in their natural habitat; a 2005 paper ( in Proceedings of the Royal Society B described the first ever wild observations of a live giant squid. The author’s photographs showed a huge squid actively hunting at 900m below the surface and they even managed to recover a tentacle that snagged on the bait line (see panels ‘e’ and ‘f’ in the figure).


We also know about the predator-prey interaction between sperm whales and giant squid from the sharp-sucker scars often seen on whale skin and stomach contents (squid beaks are indigestible making them a useful clue to the diet of sperm whales).

whale skin

Earlier this year, footage taken by a manned submersible was broadcast showing a giant squid 1000m deep in the North Pacific. The footage was captured using near-infrared light (using invisible to humans and squid) since giant squid avoid the bright white light used in conventional filming- perhaps something to do with those enormous eyes? (have a look here:

See clips from the video at

giant squid NHK Disc Chan

(picture credit: NHK/NEP/Discovery Channel via Reuters)

As an aside, it’s worth taking a look at this report on the unusual mating behaviour of giant squid – it turns out that male squid giant inject spermatophores directly into wounds that they form on the tentacles of a female:


More recently a somewhat alarming article showed how male squid overcome the challenges of mating at great depths using a ‘super squid sex organ’ – see the long white tubular structure in the picture below.


super squid sex organ


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Filed under BBC, Behaviour, Cephalopods, Oceans, Sex


April 2007

Cool video of Firefly squid coming to shore in Japan in order to lay their eggs. (BBC news, may not work outside UK.)

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February 2007

That’s actually it’s official name (ie it’s much bigger than a giant squid). This is the first intact specimen to be landed (10 m long, weighing 450kg, it took two hours to land it.

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February 2007

Amazing video of glow-in-the-dark squid attacking a lure trailed in a deep-sea marine biology study. BBC summary here, Guardian version here, original article from Proceedings of the Royal Society (free access) here.

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Filed under Behaviour, Cephalopods, Videos


January 2007

Superb trippy YouTube video (lasts nearly 6 minutes, it takes a bit of time to get into it, but it really is stunning). The science behind it all can be found here at the Tree of Life, and in this Nature article (Uni/Athens needed to get past abstract).

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October 2006

This film is taken  from the Supplementary Material of a Journal of Experimental Biology article about various forms of octopus locomotion, which can be found here. Both links are open access.

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Filed under Cephalopods, Locomotion, Videos