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If you go to the octopus, and if you're not too squeamish, dissect it. You'll find that it has a camera eye which is remarkable similar to our own. And yet we know that the octopus belongs to an invertebrate group called cephalopod mulluses, evolutionarily very distant indeed from the chordates to which we belong.

Experiments at Seattle aquarium prove that octopuses can tell individual humans apart - even when the people are dressed identically - just by looking up at them through the water.

I have always loved octopuses. No sci-fi alien is so startlingly strange.

To get to know someone so different from myself as an octopus, and to know that the individual recognised me and even enjoyed my company, was an enormous privilege. The octopuses I came to know were strong but gentle, and the suction of their suckers tasting my skin pulled me like an alien's kiss.

Octopuses have hundreds of suckers, each one equipped with its own ganglion with thousands of neurons. These 'mini-brains' are interconnected, making for a widely distributed nervous system. That is why a severed octopus arm may crawl on its own and even pick up food.

There are so many possibilities of life out there that an alien doesn't have to have green, long tentacles. They can be very similar to us.

When I would visit my octopus friend, Octavia, at New England aquarium, usually she would look me in the face, flow right over to see me, and flush red with emotion when she took my arms in hers. Often when I'd stroke her she'd turn white beneath my touch, the colour of a relaxed octopus.

I was bitten by an octopus.

If we do find ET, we will at least have something in common with them. They may live on planet Zog and have seven tentacles, but they will be made of the same kinds of atoms as us. If they have eyes, they will gaze out on the same cosmos as we do. They will, like us, trace their origins back to a 'Big Bang' 13.8 billion years ago.

Octopus can fish for prey while deciding what color and pattern to turn, what shape to make their bodies, be on alert for predators and aware how far away their dens are.