After a startling encounter with a cuttlefish, Australian philosopher Peter Godfrey-Smith set out to explore the mysterious lives of cephalopods. He was left asking: why do such smart animals live such a short time?

Inches above the seafloor of Sydneys Cabbage Tree Bay, with the proximity made possible by several millimetres of neoprene and a scuba diving tank, Im just about eyeball to eyeball with this animal: an Australian giant cuttlefish.

Even allowing for the magnifying effects of the mask snug across my nose, it must be about 60 cm( two feet) long, and the peculiarities that abound in the cephalopod family, that includes octopuses and squid, are the more striking writ so large.

Its body shaped around an internal surfboard-like shell, tailing off into a fistful of tentacles has the changing colour of velvet in lighting, and its W-shaped students lend it a stern expression. I dont believe Im imagining some acknowledgment on its part. The topic is, of what?

It was an encounter like this one at exactly the same place, actually, to the foot that first inspired Peter Godfrey-Smith to think about these most other of intellects. An Australian academic philosopher, hed lately been appointed a professor at Harvard.

While snorkelling on a visit home to Sydney in about 2007, he came here across a giant cuttlefish. The experience had a profound effect on him, establishing an unlikely framework for his own learn of philosophy, first at Harvard and then the City University of New York.

The cuttlefish hadnt been afraid it had seemed as curious about him as he was about it. But to imagine cephalopods experience of “the worlds” as some iteration of our own may sell them short, given the many millions of years of breakup between us almost twice as many as with humans and any other vertebrate( mammal, bird or fish ).

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Elle Hunt with an Australian giant cuttlefish at Cabbage Tree Bay, Manly, Sydney. Photograph: Peter Godfrey-Smith

Cephalopods high-resolution camera eyes resemble our own, but we otherwise differ in every way. Octopuses in particular are peculiarly other. The majority of their 500 m neurons are in their limbs, which can not only touch but smelling and savour they quite literally have intellects of their own.

That it was possible to observe certain kinds of subjective experience, a sense of self, in cephalopods fascinated Godfrey-Smith. How that might differ to humen is the subject of his book Other Head: The Octopus, The Sea and the Deep Origins of Consciousness, published this month by HarperCollins.

In it Godfrey-Smith maps his path through philosophical difficulties as provide guidance to cephalopods in one case quite literally, when he recounts an octopus taking his collaborator by hand on a 10 -minute tour to its lair, as if he were being led across the sea floor by a very small eight-legged child.

Charming anecdotes like this abound in Godfrey-Smiths book, particularly about captive octopuses frustrating scientists attempts at observation.

A 1959 newspaper detailed an try at the Naples Zoological Station to teach three octopuses to pull and release a lever in exchange for meat. Albert and Bertram performed in a reasonably consistent behaviour, but one named Charles tried to drag a lighting suspended above the water into the tank; squirted water at anyone who approached; and prematurely objective the experiment when he broke the lever.

Most aquariums that have attempted to keep octopuses have tales to tell of their great flees even their overnight raids of neighbouring tanks for meat. Godfrey-Smith writes of animals learning to turn off lights by aiming jets of water at them, short-circuiting the power supply. Elsewhere octopuses have plugged their tanks outflow valves, causing them to overflow.

This apparent problem-solving ability has led cephalopods( particularly octopuses, because theyve been studied more than squid or cuttlefish) to be recognised as intelligent. Half a billion neurons throw octopuses close to the scope of bird-dogs and their brains are large relative to their size, both of which provides for biologists a bumpy guidebook to brainpower.

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The coconut octopus is one of the few cephalopods known to exhibit the behaviour of using a tool. Photograph: Mike Veitch/ Alamy

In captivity, they have learned to navigate simple labyrinths, solve puzzles and open screw-top jars, while wild animals have been observed stacking rocks to protect the entryways to their dens, and disguising themselves inside coconut shell halves.

But thats also reflective of their dexterity: live animals with fewer than eight legs may accomplish less but not inevitably because it is more stupid. Theres no one metric by which to measure intelligence some markers, such as tool apply, were settled on simply since they are evident in humans.

I think its a mistake to look for a single, definitive thing, tells Godfrey-Smith. Octopuses are pretty good at sophisticated kinds of see, but how good its hard to say, in part because theyre so hard to experiment on. You get a small amount of animals in the lab and some of them refuse to do anything you are to be able to do theyre only too unruly.

He sees that curiosity and opportunism their mischief and craftsmanship, as a Roman natural historian threw it in the third largest century AD as the special characteristics of octopus intelligence.

Their great flees from confinement, too, reflect an awareness of their special circumstances and their ability to adapt to them. A 2010 experiment corroborated anecdotal reports that cephalopods are able to recognise and like or detest individual humen, even those the hell is garmented identically.

It is no stretch to say they have personalities. But the incompatibilities of their behaviour, combined with their apparent intelligence, presents an obvious trap of anthropomorphism. Its tempting, admits Godfrey-Smith, to attribute their many enigmas to some clever, human-like explanation.

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A contradiction: octopuses have big brains and short life spans. Photograph: Peter Godfrey-Smith

Opinions of octopus intelligence consequently vary within the scientific community. A fundamental precept of animal psychology, coined by the 19 th-century British psychologist C Lloyd Morgan, tells no behaviour should be attributed to a sophisticated internal process if it can be explained by a simpler one.

That is indicative of a general predilection for simplicity of hypotheses in science, tells Godfrey-Smith, that as a philosopher he is not convinced by. But scientific research across the board has become more outcome-driven as a result of the cycle of funding and publishing, and he is in the privileged post of being able to ask open-ended questions.

Thats a great luxury, to be able to roam around year after year, putting pieces together very slowly.

That process, set in motion by his possibility encounter with a cuttlefish ten years ago, is ongoing. Now back are stationed in Australia, lecturing at the University of Sydney, Godfrey-Smith says his study of cephalopods is increasingly influencing his professional life( and his personal one: Arrival, the 2016 film about first linked with cephalopod-esque foreigners, was a good, inventive film, he tells, though the invaders were a bit more like jellyfish ).

When philosophers mull the mind-body trouble , none poses quite such a challenge as that of the octopuss, and the study of cephalopods makes some clues to questions about the descents of our own consciousness.

Our last common ancestor existed 600 m years ago and was thought to resemble a flattened worm, perhaps only millimetres long. Yet somewhere along the line, cephalopods developed high-resolution, camera eyes as did we, entirely independently.

A camera eye, with a lens that focuses an image on a retina weve got it, theyve got it, and thats it, tells Godfrey-Smith. That it was arrived at twice in such vastly different animals makes pause for was just thinking about the process of evolution, as does their inexplicably short life spans: most species of cephalopods live only about one to two years.

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The learn of cephalopods makes some clues to questions about the descents of our own consciousness. Photograph: Peter Godfrey-Smith

When I learned that, I was just amazed it was such a astonish, tells Godfrey-Smith, somewhat sadly. Id just gotten to know the animals. I reckoned, Ill be visiting these guys for ages. Then I reckoned, No, I wont, theyll be dead in a few months.

Its perhaps the biggest contradiction presented by live animals that has no dearth of contradictions: A really big brain and a really short life. From an evolutionary perspective, Godfrey-Smith explains, it does not give a good return on investment.

Its a bit like spending a vast amount of money to do a PhD, and then youve got two years to make use of it … the accounting is really weird.

One possibility is that an octopuss brain needs to be powerful only to preside over such an unwieldy kind, in the same way that personal computers would need a state-of-the-art processor to perform a large volume of complex tasks.

I mean, the body is so hard to control, with eight limbs and every possible inch an elbow. But that justification doesnt account for the panache, even playfulness with which they apply it.

They behave smartly, they do all these fiction, inventive things that line of reasoning doesnt resolve things, by any stretching, tells Godfrey-Smith. Theres still a somewhat mysterious element there.

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