Paul D Stewart / Illustration of Giant Octopus (Octopus dofleini) attacking a ship, 1815 copperplate engraving from Bertuch's 'Bilderbuch fur kinder' 16 plate 5. with contemporary colour. 'Colosal Polypus' (octopus) a...

Alex Mustard / The eye of a Pacific giant octopus (Enteroctopus dofleini). Browning Pass, Vancouver Island, British Columbia, Canada

Alex Mustard / Pacific giant octopus (Enteroctopus dofleini) hunts for food on a colourful reef in Browning Pass, Vancouver Island, British Columbia, Canada

Alex Mustard / Common Sydney octopus (Octopus tetricus) detail of eyes. Sydney Harbour. New South Wales, Australia

Solvin Zankl / Octopus (Octopus vulgaris), close up of eye, San Pietro Island, Sardinia, Italy, Mediterranean, July

Jeff Rotman / Close up of eye of Giant Pacific Octopus (Enteroctopus dofleini), British Columbia, Canada, Pacific Ocean.

Juergen Freund / Blue-ringed octopus (Hapalochlaena lunulata) swimming through water, Batangas, Philippines

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) hiding in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) in a bottle cap getting a new shell to use as its home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) hiding in its bottle cap home, using a shell as a door. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) hiding in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Tropical blue-ringed octopus (Hapalochlaena lunulata) hunting. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) ready to flee from its coconut shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Poison ocellate octopus (Octopus mototi) on seabed. Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) ready to flee from its coconut shell home. Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Wonderpus (Wunderpus photogenicus) octopus on sea bed, Lembeh Strait, North Sulawesi, Indonesia.

Wild Wonders of Europe / Zankl / Common octopus (Octopus vulgaris) close-up of eyes, Malta, Mediteranean, May 2009. WWE INDOOR EXHIBITION Wild Wonders kids book.

Wild Wonders of Europe / Sá / Octopus on rocks, Deserta Grande, Desertas Islands, Madeira, Portugal, August 2009

Wild Wonders of Europe / Banfi / Common octopus (Octopus vulgaris) in hole, Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

David Shale / Deepsea octopus (Benthoctopus johnsoniana) Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Deepsea octopus (Benthoctopus johnsoniana) Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Octopod {Grimpoteuthis discoveryi} Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / View inside the mantle of the deepsea Octopod {Grimpoteuthis discoveryi} Mid-Atlantic Ridge, North Atlantic Ocean

Wild Wonders of Europe / Zankl / Common octopus (Octopus vulgaris) on rock, Malta, Mediteranean, May 2009

David Shale / Deepsea octopus (Grimpoteuthis sp), "Dumbo", North Atlantic.

Wild Wonders of Europe / Pitkin / Common octopus (Octopus vulgaris) hunting at night, Elephant Bay, Lavezzi Islands, Corsica, France, September 2008

Kevin Schafer / Ring-tailed Lemur (Lemur catta) in Octopus tree, Mantady National Park, Madagascar

Solvin Zankl / Atlantic longarm octopus (Octopus defilippi), Atlantic ocean

Solvin Zankl / Deepsea pelagic octopod (Vitreledonella richardi) Atlantic ocean.

Solvin Zankl / Close up of tentacles and suckers of a Deepsea octopus {Bolitaena pygmaea} Atlantic ocean

David Shale / Deepsea cirrate octopod (Stauroteuthis syrtensis) 830m, Gulf of Maine, Atlantic

David Shale / Deepsea cirrate octopod {Stauroteuthis syrtensis} 830m, Gulf of Maine, Atlantic

David Shale / Paper argonaut (Argonauta sp) Gulf of Mexico, deep sea species

David Shale / Deepsea octopus (Benthoctopus sp) mantle showing suckers, deep sea Atlantic oceandeep sea

Jeff Rotman / Giant Pacific octopus squirting ink at diver, British Columbia Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) squirting ink in defense as it jets away, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) female guarding her eggs, Quadra Island, British Columbia, Canada

Chris Newbert / Octopus (Octopus sp) portrait, underwater, Kona, Hawaii

Norbert Wu / California Bigeye Octopus (Octopus californicus) deep sea species swimming, California

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) flaring out its arms as it settles to the ocean bottom after swimming, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) flaring out its arms as it prepares to drop to the ocean bottom after swimming, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) eggs and newborn, Victoria, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) eggs and newborn, Victoria, British Columbia, Canada

Fred Bavendam / Paper Nautilus (Argonauta nodosa) is actually a pelagic Octopus, females make the parchment-like shell to carry incubating eggs, South Australia

Norbert Wu / California Two-spot Octopus (Octopus bimaculoides) juveniles hatch from egg cases, southern California

Norbert Wu / California Bigeye Octopus (Octopus californicus) swimming, southern California

Norbert Wu / California Bigeye Octopus (Octopus californicus) deep sea species swimming underwater, California

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) scavenging on a dead Blue Dog (Squalus acanthias), Campbell River, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) using its suction discs to hold two crabs it has caught, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) scurrying across the ocean floor as it forages for crabs, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) eggs, Victoria, British Columbia, Canada

Flip Nicklin / Octopus (Octopus sp) baby swimming through water column

Constantinos Petrinos / Veined octopus inside shell {Octopus marginatus}, Lembeh Strait, N Sulawesi, Indonesia. Shells are found in the seabed and dug up and cleaned by octopus, which then climbs inside for protection.

Constantinos Petrinos / Common octopus on sand, Greece

Georgette Douwma / Common reef / Day octopus hunting for crustaceans and fish, enclosing coral head with arms and webs, using the arm tips to flush out prey into waiting suckers {Octopus cyaneus} Andaman Sea, Thailand

Georgette Douwma / Common reef / Day octopus {Octopus cyaneus} at rest on coral reef Sipadan, Malaysia

Jeff Rotman / Octopus parachutes down on prey, Red Sea

Constantinos Petrinos / Veined / Marginated octopus {Octopus marginatus} holds crisp bag against back for protection. Lembeh, Sulawesi, Indonesia

Jeff Rotman / Diver films bottlenose dolphin playing with octopus. Egypt, Red Sea Model released.

Jeff Rotman / Octopus swimming in Red Sea. Egypt

Jeff Rotman / Giant Pacific octopus (Octopus dofleini) British Columbia Model released.

Jeff Rotman / Giant Pacific octopus (Octopus dolfeini) jets away. British Columbia Model released.

Sue Flood / Octopus for sale in fish market, Otaru, Hokkaido, Japan. Otaru is one of Hokkaido's key ports, and serves the nearby city of Sapporo and is famous for its Sushi, June 2012

Philippe Clement / Barrel jellyfish (Rhizostoma octopus) washed up on beach along the North Sea coast, Nord-Pas-de-Calais, France, August

Alex Mustard / A Caribbean reef octopus (Octopus briareus) swimming through spawning Sea rods (Pseudoplexaura) at night, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Enrique Lopez-Tapia / A fisherman holding his freshly caught octopus, Jambiani coast, Zanzibar Island, Tanzania

Jeff Rotman / Common reef octopus (Octopus cyanea) with diver observing, Eilat, Israel, Red Sea. Model released. January 2011 Model released.

Jeff Rotman / Common reef octopus (Octopus cyanea) camouflaged on coral reef, Eilat, Israel, Red Sea

Alex Mustard / Common reef / day octopuses (Octopus cyanea) courting. The male, on the right, is rearing up and showing his mouth and tentacles, while still maintaining contact with the female. This is a rarely seen...

Alex Mustard / Common reef / day octopuses (Octopus cyanea) mating. The male, on the right, it passing his sperm to the female, on the left, by placing it under her mantle. His arm is visible on her body next to her...

Alex Mustard / Tropical blue ring octopus (Hapalochlaena lunulata) is small but has one of the most venomous creatures in the ocean, its bite injects a neurotoxin that paralyses its victim. It flashes its blue rings...

Alex Mustard / A blue ring octopus (Hapalochlaena lunulata) flashes its blue rings as it crawls over a coral reef. Kapalai Island, Sulu Sea, Sabah, Borneo, Malaysia..

Alex Mustard / Common Sydney octopus (Octopus tetricus) peers out from its den. Sydney Harbour, New South Wales, Australia.

Alex Mustard / Two spotted octopus (Octopus bimaculatus) moves across rocks. Revillagigedos Islands, Mexico.

Alex Mustard / A pair of mimic octopus (Thaumoctopus mimicus) mating. The male, behind, has grabbed the female and grasps her as he tries to place his sperm sac inside her mantle with his arm. Lembeh Strait, Molucca...

Alex Mustard / A pair of mimic octopus (Thaumoctopus mimicus) mating/courtship. The smaller male, right, is riding on top of the female as he tries to place his sperm sac inside her mantle with his arm. Lembeh Strai...

Alex Mustard / A veined octopus (Amphioctopus marginatus) peers out from a discarded plastic bottle. Lacking a skeleton, octopuses can squeese their bodies into the smallest spaces and through the tiniest holes. Lem...

Alex Mustard / Tropical blue ringed octopus (Hapalochlaena lunulata) free swims just above the seabed. Lembeh Strait, Molucca Sea Sulawesi, Indonesia

Alex Mustard / A young veined octopus (coconut octopus: Amphioctopus marginatus) shelters in an empty bivalve shell by pulling the two halves together with its arms. Lembeh Strait, Molucca Sea, Sulawesi, Indonesia.

Alex Mustard / A common reef octopus (Octopus cyanea) foraging attracts several large reef fish, hoping to get an easy meal. Octopuses may try to hit fish with their arms to scare them off. Cannibal Rock, Sawu Sea,...

Alex Mustard / A common octopus (Octopus vulgaris) scavenges a dead fish, dragging it to its burrow. West Palm Beach, Florida, USA

Alex Mustard / An Atlantic long arm octopus (Octopus defilippi) swims across the seabed. This is a typical swimming posture for long arm octopus, but it has been suggested as mimicking a poisonous sole in the mimic...

Alex Mustard / A pair of mating Atlantic longarm octopus (Octopus defilippi), with the male, on the right, gripping the female, West Palm Beach, Florida, USA

Alex Mustard / A common octopus (Octopus vulgaris) shelters between rocks. Gran Canaria, Canary Islands, Spain

Alex Mustard / A long arm octopus (Octopus sp) looks out from its burrow in a rubble slope. Java Sea, Seraya, Tulamben, Bali, Indonesia, South East Asia

Alex Mustard / A pair of wunderpus octopus (Wunderpus photogenicus) during courtship/mating. The smaller male (right) is reaching round behind the female and trying to pass her his sperm with his hectocotylus (third...

Alex Mustard / A wunderpus octopus (Wunderpus photogenicus) prowling over the seabed searching for food, Java Sea, Amed, Bali, Indonesia

Alex Mustard / A wunderpus octopus (Wunderpus photogenicus) hunting by expanding its arms into a net to capture prey. Java sea, Amed, Bali, Indonesia.

Alex Mustard / A wunderpus octopus (Wunderpus photogenicus) warning pose, which includes flared arms and strongly contrasting striped pattern, at the entrance to its burrow, Java Sea, Amed, Bali, Indonesia

Alex Mustard / A wunderpus octopus (Wunderpus photogenicus) warning pose, which includes flared arms and strongly contrasting striped pattern. At the entrance to its burrow. Java sea, Amed, Bali, Indonesia.

Alex Mustard / A mimic octopus (Thaumoctopus mimicus) makes a 'poisonous sole' impression, Java Sea, Puri Jati, Bali, Indonesia. South East Asia, Java Sea