Shane Gross / Common octopus (Octopus vulgaris) hunting on a reef off Eleuthera Island, Bahamas.

Shane Gross / Common octopus (Octopus vulgaris) on a coral reef in The Bahamas. August.

Franco Banfi / Octopus, (Octopus vulgaris), splashing a cloud of ink and swim away with Bearded fireworm, (Hermodice carunculata) who want to eat a small octopus, top of the wall of Bisevo, Vis Island, Croatia, Adri...

Fred Olivier / Common reef octopus (Octopus cyanea) hunting, with Coral trout (Plectropomus) following to pick up scraps, Uepi Island, Solomon Islands.

Fred Olivier / Tracking shot of a Common reef octopus (Octopus cyanea) hunting, changing colour for camouflage, and wrapping coral heads to capture prey, Uepi Island, Solomon Islands.

David Fleetham / Day / Big blue octopus (Octopus cyanea) with diver in background. Hawaii. September 2012.

SCOTLAND: The Big Picture / European river otter (Lutra lutra) female bringing octopus ashore for cub, Shetland, Scotland, UK, October.

Alex Mustard / Reef octopus (Octopus cyanea) portrait near wreck. Gubal Island, Egypt. Red Sea.

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

David Fleetham / Day / Common Reef Octopus (Octopus cyanea) swimming. Hawaii.

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

David Fleetham / Common reef octopus (Octopus cyanea), Hawaii.

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

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

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

Brandon Cole / Day / Common reef octopus {Octopus cyaneus} Hawaii

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

Constantinos Petrinos / Common octopus on sand, Greece

Shane Gross / Common octopus (Octopus vulgaris) hunting on a reef off Eleuthera Island, Bahamas.

Shane Gross / Common octopus (Octopus vulgaris) on a coral reef, The Bahamas. August.

Shane Gross / Common octopus (Octopus vulgaris) hiding in her den surrounded by empty shells, the remains of her meals. Eleuthera, Bahamas.

Shane Gross / Common octopus (Octopus vulgaris) hunting over sand and coral seabed off Eleuthera, Bahamas.

Franco Banfi / Common Octopus (Octopus vulgaris), South Tenerife, Canary Islands, Atlantic Ocean.

Magnus Lundgren / Violet blanket octopus (Tremoctopus violaceus) juvenile. Balayan Bay, Luzon Island, Philippines, May. Magnus

Magnus Lundgren / Wild Wonders of China / Day octopus (Octopus cyanea) female with her eggs in den; she will die soon after they hatch. Breathing siphon clearly visible. Longdong, Northeast, Taiwan. Lundgren

Magnus Lundgren / Wild Wonders of China / Day octopus (Octopus cyanea) female with her eggs in den, and she will die soon after they hatch. Longdong, Northeast, Taiwan. Lundgren

Magnus Lundgren / Violet blanket octopus (Tremoctopus violaceus) juvenile, Balayan Bay, Luzon Island, Philippines Magnus

Magnus Lundgren / Violet blanket octopus (Tremoctopus violaceus) juvenile, Balayan Bay, Luzon Island, Philippines Magnus

Magnus Lundgren / Violet blanket octopus (Tremoctopus violaceus) Balayan Bay, Luzon Island, Philippines Magnus

Franco Banfi / Octopus, (Octopus vulgaris) fighting with Bearded fireworm, (Hermodice carunculata) that wants to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris) seeking help from a bigger octopus after being attacked by a Bearded fireworm (Hermodice carunculata) top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterr...

Franco Banfi / Octopus, (Octopus vulgaris) seeking help from a bigger octopus after being attacked by a Bearded fireworm, (Hermodice carunculata) top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediter...

Franco Banfi / Octopus, (Octopus vulgaris), seeking help from a bigger octopus after being attacked by Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Ad...

Franco Banfi / Octopus, (Octopus vulgaris), take away a small octopus attacked by Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterra...

Franco Banfi / Octopus, (Octopus vulgaris), take away a small octopus attacked by Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterra...

Franco Banfi / Octopus, (Octopus vulgaris) carrying away a small octopus attacked by Bearded fireworm, (Hermodice carunculata) which wants to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Med...

Franco Banfi / Octopus, (Octopus vulgaris), take away a small octopus attacked by Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterra...

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) who want to eat a small octopus, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) who want to eat a small octopus, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris), swim away with Bearded fireworm, (Hermodice carunculata) who want to eat a small octopus, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) which was trying to eat a smaller octopus, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterran...

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Octopus, (Octopus vulgaris), fighting with Bearded fireworm, (Hermodice carunculata) who want to eat it, top of the wall of Bisevo, Vis Island, Croatia, Adriatic Sea, Mediterranean