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Richard Schweid - Octopus

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Richard Schweid Octopus

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The octopus is generally acknowledged to be the most intelligent invertebrate in the world: according to marine biologists the common octopus (Octopus vulgaris) has a mental capacity comparable with that of a dog. If you look at an octopus the octopus will look back at you, and actually think about and remember what it is seeing.
Octopus relates both what is known and unknown about the mind of an octopus, as well as detailing the animals remarkable natural history. It is thought to have developed intelligence to compensate for the lack of a shell, rather like human beings. Thats where the similarity ends, however the octopus is short-lived, with a lifespan of two years at most, and it mates only once during its life.
A wily creature with an extremely sophisticated camouflage system, the octopus can change the color of its skin to blend in with its surroundings; should this fail it deploys clouds of ink to cover a hasty retreat. And there is no more adept escape artist than an octopus, which can squeeze its boneless body through seemingly impossibly tight openings as many an unwary octopus keeper has discovered to their cost.
Octopus documents the long and multi-faceted relationship between human and cephalopod. It shows how, over the millennia, some people have considered octopuses as nothing more than a tasty meal, and how they are an important component of the modern global fish and seafood industry. Other cultures regard them as erotic totems, or symbols of the darkest evils. The octopus has always fascinated people, and this book will immerse readers in its amazing world.

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Octopus Animal Series editor Jonathan Burt Already published Ant - photo 1
Octopus

Picture 2

Animal

Series editor: Jonathan Burt

Already published

Ant Charlotte Sleigh Ape John Sorenson Bear Robert E. Bieder Bee Claire Preston

Camel Robert Irwin Cat Katharine M. Rogers Chicken Annie Potts Cockroach Marion Copeland

Cow Hannah Velten Crocodile Dan Wylie Crow Boria Sax Deer John Fletcher Dog Susan McHugh

Dolphin Alan Rauch Donkey Jill Bough Duck Victoria de Rijke Eel Richard Schweid

Elephant Dan Wylie Falcon Helen Macdonald Fly Steven Connor Fox Martin Wallen

Frog Charlotte Sleigh Giraffe Edgar Williams Gorilla Ted Gott and Kathryn Weir

Hare Simon Carnell Horse Elaine Walker Hyena Mikita Brottman Kangaroo John Simons

Leech Robert G. W. Kirk and Neil Pemberton Lion Deirdre Jackson Lobster Richard J. King

Monkey Desmond Morris Moose Kevin Jackson Mosquito Richard Jones Octopus Richard Schweid

Ostrich Edgar Williams Otter Daniel Allen Owl Desmond Morris Oyster Rebecca Stott

Parrot Paul Carter Peacock Christine E. Jackson Penguin Stephen Martin Pig Brett Mizelle

Pigeon Barbara Allen Rabbit Victoria Dickenson Rat Jonathan Burt Rhinoceros Kelly Enright

Salmon Peter Coates Shark Dean Crawford Snail Peter Williams Snake Drake Stutesman

Sparrow Kim Todd Spider Katja and Sergiusz Michalski Swan Peter Young Tiger Susie Green

Tortoise Peter Young Trout James Owen Vulture Thom van Dooren Whale Joe Roman

Wolf Garry Marvin

Octopus
Richard Schweid

REAKTION BOOKS Published by REAKTION BOOKS LTD 33 Great Sutton Street London - photo 3

REAKTION BOOKS

Published by
REAKTION BOOKS LTD
33 Great Sutton Street
London EC1V 0DX, UK
www.reaktionbooks.co.uk

First published 2013
Copyright Richard Schweid 2013

All rights reserved

No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise without the prior permission of the publishers

Page references in the Photo Acknowledgements and
Index match the printed edition of this book.

Printed and bound in China by C&C Offset Printing Co., Ltd

A catalogue record for this book is available from the British Library

eISBN: 9781780232157

Contents

Octopus Body When you watch an octopus an octopus watches you back A - photo 4

Octopus Body

When you watch an octopus, an octopus watches you back. A surprising degree of unanimity on this point exists among people who spend a lot of time observing octopuses (the generally accepted plural spelling for octopus). They all agree that when they do so, the animals closely observe them in turn. Gazing for any length of time at an octopus, particularly Octopus vulgaris, the common octopus the species most Europeans, Americans and Asians know leads to the inescapable conclusion that the animal is looking back, and is somehow thinking about what it is seeing. Jacques Cousteau, who encountered thousands of octopuses during his lifetime of diving, wrote in his book Octopus and Squid: The Soft Intelligence (1973) that an undersea diver who encounters an octopus immediately senses something unusually responsive in its gaze: One has the sensation of lucidity, of a look much more expressive than that of any fish, or even any marine mammal.

No researcher working with octopuses remains oblivious to the fact that he or she is under observation, no matter how rigorous and rational their scientific approach. Roger Hanlon, a senior scientist at the Marine Biological Laboratory in Woods Hole, Massachusetts, has been working with octopuses since 1968. He is widely considered to be among the most judicious and careful of current octopus researchers, and his book Cephalopod Behavior (1996) is still the standard reference work in the field. Even he writes that there is something disconcerting about being regarded by an octopus: anyone who has seen an octopus in an aquarium will have had the uncanny impression of being carefully watched.

Octopus in a fresco in Voronet monastery Romania mid-16th century Mosaic - photo 5

Octopus in a fresco in Voronet, monastery, Romania, mid-16th century.

Mosaic from a ruin at Pompeii The octopus itself is an ancient invertebrate - photo 6

Mosaic from a ruin at Pompeii.

The octopus itself is an ancient invertebrate marine animal. Like their close relatives, squids and cuttlefishes, octopuses belong to the cephalopodan class of coleoid molluscs. The name is derived from the Greek words kephale and podus, meaning head-footed, and refers to the fact that the animals arms are directly connected to its head. The class consists of squids, cuttlefishes and octopuses along with nautiluses, the only group of the four to have shells.

Scuba divers regularly report handling octopuses Franois-Nicolas - photo 7

Scuba divers regularly report handling octopuses.

Franois-Nicolas Chifflart The Monster engraving for an 1869 edition of Victor - photo 8

Franois-Nicolas Chifflart, The Monster, engraving for an 1869 edition of Victor Hugos Toilers of the Sea.

Currently some 100 species are identified as members of the genus Octopus, and another 200 belong to other genera. Octopuses live in all the worlds oceans at a variety of depths. The Hawaiian day octopus (Octopus cyanea) lives in shallow tide pools, while the spoon-armed octopus (Bathypolypus arcticus) can be found on the dark Atlantic Ocean floor at 800 m (0.5 miles) deep. Octopuses also come in all sizes. At the small end of the scale is the tiny Atlantic pygmy octopus (Octopus joubini), with a mantle length of 4.5 cm (1.8 in) and arms of 9 cm (3.5 in), or the even smaller California Lilliput octopus, Octopus micropyrsus, which is about 2 cm across, while the giant Pacific octopus (Enteroctopus dofleini) can weigh over 45 kg (100 lb) and measure well over 6 m (20 ft) between the tips of its arms. Reproductivestrategies differ, even among close relatives. With the exception of the Mediterraneans football octopus (Ocythoe tuberculata), which hatches its eggs internally and gives birth to live young, all other octopuses are oviparous, hatching their eggs externally. The Verrills two-spot octopus (Octopus bimaculatus), which lives on rocky reefs from California to Panama, produces 20,000 tiny eggs at a time, while the closely related California two-spot octopus (Octopus bimaculoides) opts for 800 large eggs. While all octopuses use some measure of camouflage for defence, none of them equal the ingenuity of the mimic octopus (

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