Linda Pitkin / 2020VISION / Pink sea fan / Warty coral (Eunicella verrucosa) with attached eggs of a Common squid (Loligo vulgaris), eggcase of a Lesser-spotted dogfish (Scyliorhinus canicula), and Spiny starfish (Marthasterias...

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 / 2020VISION / Stout bobtail squid (Rossia macrosoma) on the seabed, Loch Creran, Scotland, UK, June.

Alex Mustard / Big fin reef squid (Sepioteuthis lessoniana) descends from open water to the reef at night. Arafur Sea, Triton Bay, West Papua, Indonesia.

Alex Mustard / Caribbean reef squid (Sepioteuthis sepioidea) in mid water over a coral reef. East End, Grand Cayman, Cayman Islands, West Indies. Caribbean Sea.

Alex Mustard / Caribbean reef squid (Sepioteuthis sepioidea) North Wall, Grand Cayman, Cayman Islands, West Indies, Caribbean Sea

Alex Mustard / A Caribbean reef squid (Sepioteuthis sepioidea) perches on the hand of a diver. North Wall, Grand Cayman, Cayman Islands, West Indies, Caribbean Sea, April 2008, no release available.

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 / Wing-armed squid (Stenoteuthis pteropus) - deep sea specimen from South Atlantic

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

Alex Mustard / 2020VISION / Two male Common cuttlefish (Sepia officinalis) compete for a female (on right) during courtship, Torbay, Devon, UK, May. 2020VISION Exhibition. 2020VISION Book Plate. Did you know? Cuttlefish have an...

Alex Mustard / 2020VISION / Pair of Common cuttlefish (Sepia officinalis), female in front of male, during spring spawning season, Babbacombe Bay, Torbay, Devon, UK, May

Alex Mustard / 2020VISION / Pair of Common cuttlefish (Sepia officinalis), female in foreground and male behind, note circular mating scars on female caused by the males suckers, Babbacombe Bay, Torbay, Devon, UK, May. Did you k...

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 / Pfeffer's flamboyant cuttlefish (Metasepia pfefferi) hunting over coral reef, 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.

Tim Laman / Pfeffer's Flamboyant Cuttlefish (Metasepia pfefferi) West Papua, Indonesia, April 2007

Juergen Freund / Boat at surface tracking Nautilus movements with a mobile receiver, off Queensland, Australia, 2007

Juergen Freund / Chambered nautilus (Nautilus pompilius) with radio transmitter, Indo-pacific

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 squid from midwater catch 195-498m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Glass squid {Teuthowenia megalops}, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Deepsea squid (Histioteuthis sp) showing funnel, from between 188m/617ft and 507m/1,663ft depth, night, Mid-Atlantic Ridge, North Atlantic Ocean

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 / Piglet squid {Helicocranchia sp} from between 500 and 200m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Deepsea squid (Histioteuthis sp) from between 188m/617ft and 507m/1,663ft depth, night, 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

Wild Wonders of Europe / Zankl / Common cuttlefish (Sepia officinalis) profile, Malta, Mediteranean, May 2009

Wild Wonders of Europe / Zankl / Squid eggs on the P29 patrol boat wreck, 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

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 / Deep sea Glass squid {Cranchia sp} from Mid-Atlantic Ridge

David Shale / Deepsea squid {Histioteuthis bonellii} showing chromatophores changing colour, from the Mid-Atlantic Ridge, 200 - 50m

David Shale / Deepsea squid {Histioteuthis bonellii} showing chromatophores changing colour, from the Mid-Atlantic Ridge, 200 - 50m

David Shale / Deepsea squid {Histioteuthis bonellii} showing chromatophores changing colour, from the Mid-Atlantic Ridge, 200 - 50m

David Shale / Bobtail squid {Rossia sp} benthic, Barents sea, Northern Europe

Juergen Freund / Portrait of Chambered Nautilus {Nautilus pompilius} Underwater, Papua New Guinea

Juergen Freund / X-ray of the shell of the Pearly / Chambered nautilus {Nautilus pompilius} showing the internal chambers of the shell.

Georgette Douwma / Pharao cuttlefish (Sepia pharaonis), very small male guarding large egg-laying female. Andaman Sea, Thailand.

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 / Deepsea squid {Octopoteuthis megaptera} Gulf of Maine, Atlantic

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

Georgette Douwma / Pharaoh cuttlefish {Sepia pharaonis} male guarding egg laying female, Andaman Sea, Thailand

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

Doug Perrine / Squid {Abralia veranyi} Bahamas

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

Alan James / Common cuttlefish {Sepia officinalis} close up of skin patterns Devon, UK

Juergen Freund / Mating pair of Big fin reef squids {Sepioteuthis lessoniana} Indo Pacific

DOC WHITE / Sea otter underwater feeding on squid Monterey Bay captive {Enhydra lutris}

Juergen Freund / Broadclub cuttlefish mating and egg laying {Sepia latimanus} Indo-Pacific

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 / Broadclub cuttlefish hunting technique - mesmorises fish by pulsating colour along body

Peter Scoones / Broadclub cuttlefish male display {Sepia latimanus} Indonesia

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

Conrad Maufe / Nigel Marven with Giant squid washed up on beach {Architeuthis sp} Tasmania, Australia

Jeff Rotman / Octopus parachutes down on prey, Red Sea

David Shale / Eye of deep sea squid {Pyroteuthis sp} Atlantic ocean

Juergen Freund / Big fin reef squid {Sepioteuthis lessonians} Indo Pacific

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

Juergen Freund / Group of Broadclub cuttlefish gathered as females lay eggs on reef {Sepia latimanus} Sulu-sulawesi seas, Indo-Pacific

Constantinos Petrinos / Big fin reef squid in deep water {Sepioteuthis lessonians} Sulawesi, Indonesia Indo-Pacific

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 Daly / Little Cuttlefish / Bobtail Squid (Sepiola atlantica). Maseline harbour, Sark, British Channel Islands, October.

Sue Daly / Little Cuttlefish / Bobtail Squid (Sepiola atlantica). Maseline harbour, Sark, British Channel Islands, October.

Sue Daly / Common Cuttlefish (Sepia officinalis). Maseline Harbour, Sark, British Channel Islands, September.

Juan Manuel Borrero / Illustration of internal Nautilus anatomy. Pencil and watercolor painting.

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