Alex Mustard / Mimic octopus (Thaumoctopus mimicus) hiding, half buried in the sand. Java Sea, Jati, Bali, Indonesia, South East Asia

Alex Mustard / A young veined octopus / coconut octopus (Amphioctopus marginatus) shelters in an old snail shell, while exposed on the open sand. Java Sea, Puri Jati, Bali, Indonesia, South East Asia.

Alex Mustard / An undescribed species of blue ring octopus (Hapalochlaena sp.) swimming at night. Java Sea, Puri Jati, Bali, Indonesia. South East Asia.

Alex Mustard / Veined octopus /coconut octopus (Amphioctopus marginatus) young, shelters in an old bivalve shell, while exposed on the open sand. Puri Jati, Bali, Indonesia, South East Asia.

Alex Mustard / Southern / pacific blue-ringed octopus (Hapalochlaena maculosa) swims across the seabed. Port Philip Bay, Blairgowrie, Melbourne, Victoria, Australia.

Alex Mustard / A Southern sand octopus (Octopus kaurna) digs into the sediment with its long arms at night. While many octopus dig holes, this is the only known species that forms a mucous-lined burrow complete with...

Alex Mustard / Southern sand octopus (Octopus kaurna), photographed at night. This species spends the day burried, with a thin chimney to the surface. Port Philip Bay, Blairgowrie, Melbourne, Victoria, Australia

Alex Mustard / Southern keeled octopus (Octopus berrima) moves across the sand at night. Port Philip Bay, Blairgowrie, Melbourne, Victoria, Australia.

Chris Newbert / Octopus (Abdopus aculeatus) camouflaged on reef, Indonesia

Chris Newbert / Veined Octopus (Octopus marginatus) in bi-valve shell, Indonesia

Chris Newbert / Veined Octopus (Octopus marginatus) in bi-valve shell, Indonesia

Chris Newbert / Greater Blue-ringed Octopus (Hapalochlaena lunulata), Indonesia

Todd Mintz / Giant Pacific octopus (Enteroctopus dofleini) Port Hardy, British Columbia, Canada.

Todd Mintz / Giant Pacific octopus (Enteroctopus dofleini) Port Hardy, British Columbia, Canada.

Todd Mintz / Giant Pacific octopus (Enteroctopus dofleini) Port Hardy, British Columbia, Canada.

Todd Mintz / Giant Pacific octopus (Enteroctopus dofleini) Port Hardy, British Columbia, Canada.

Brent Stephenson / New Zealand Fur Seal (Arctocephalus forsteri) eating an octopus (Order Octopoda) at sea. Off Kaikoura, Canterbury, New Zealand, October.

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

Solvin Zankl / Octopus (Octopus vulgaris) camouflaged, resting, San Pietro Island, Sardinia, Italy, Mediterranean, July

Solvin Zankl / Octopus (Octopus vulgaris) camouflaged, San Pietro Island, Sardinia, Italy, Mediterranean, July

Pedro Narra / Juvenile Bottlenose dolphin (Tursiops truncatus) catching a Common octopus (Octopus vulgaris) Sado Estuary, Portugal, November

Jeff Rotman / Benthic Octopus (Octopus rubescens) camouflaged on coral, Channel Islands, California, USA, Pacific Ocean

Jeff Rotman / Scientist holding a poisonous Pacific blue-ringed octopus (Hapalochlaena maculosa) in his hand. The octopus can emmit a fatal neurotoxin through it's saliva when provoked, and there is no known anti-v...

Jeff Rotman / Pelagic Octopus (Tremoctopus violaceus) in open ocean at night, Red Sea, Egypt

Jeff Rotman / Giant pacific octopus (Enteroctopus dofleini) feeding on a Cabazon fish (Scorpaenichthys marmoratus). British Columbia, Canada, North Pacific Ocean.

Jeff Rotman / Giant Pacific Octopus (Enteroctopus dofleini) weighing over 20 Kilos interacting with a diver. Victoria Island, British Columbia, Canada, Pacific Ocean. Model released.

Jeff Rotman / Giant Pacific Octopus (Enteroctopus dofleini) swimming, squirting ink at a diver, British Columbia, Canada, Pacific Ocean. Model released.

Jeff Rotman / Close up of suckers on the tentacles of Giant Pacific Octopus (Enteroctopus dofleini) British Columbia, Canada, Pacific Ocean.

Jeff Rotman / Close up of Giant pacific octopus (Octopus dofleini) crawling along the seabed, British Columbia, Canada, Pacific

Jeff Rotman / Giant pacific octopus (Octopus dofleini) crawling along the seabed, British Columbia, Canada, Pacific

Georgette Douwma / Day / Common Reef Octopus (Octopus cyanea), mating pair on wreck. Egypt, Red Sea.

Juergen Freund / Blue-ringed octopus (Hapalochlaena lunulata) moving over seabed, Batangas, Philippines.

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

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

Juergen Freund / Tiny Coconut / Veined octopus (Amphioctopus marginatus) inside an empty bivalve shell, Batangas, Philippines.

Juergen Freund / Coconut / veined octopus (Amphioctopus marginatus) using a discarded glass tumbler as its home, Batangas, Philippines.

Juergen Freund / Coconut / veined octopus (Amphioctopus marginatus) using a discarded glass tumbler as its home, Batangas, Philippines.

Juergen Freund / Coconut / veined octopus (Amphioctopus marginatus) using a discarded glass tumbler as its home, Batangas, Philippines

Juergen Freund / Coconut octopus (Amphioctopus / Octopus marginatus) inside an empty snail shell, Batangas, Philippines.

Juergen Freund / Longarm octopus (Octopus sp) well camouflaged in the sand on seabed, North Sulawesi, Indonesia.

Juergen Freund / Mimic octopus (Thaumoctopus mimicus) entering a burrow on the seabed, North Sulawesi, Indonesia.

Juergen Freund / Mimic octopus (Thaumoctopus mimicus) mating pair, North Sulawesi, Indonesia.

Juergen Freund / Poison ocellate octopus (Amphioctopus mototi) walking over seabed on its tentacles, Batangas, Philippines.

Juergen Freund / Reef octopus (Octopus cyanea) foraging on coral reef when a Moray eel comes out for a surprise attack, Komodo NP, Indonesia, Indo-pacific.

Juergen Freund / Reef octopus (Octopus cyanea) foraging on coral reef, Komodo NP, Indonesia, Indo-pacific.

Juergen Freund / Tiny octopus on a pin cushion starfish, Indo-pacific.

Birgitte Wilms / Blue-ringed Octopus (Hapalochlaena sp) camouflaged in reef, Papua New Guinea

Juergen Freund / Mimic Octopus (Thaumoctopus mimicus) impersonating a flatfish or flounder. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Mimic Octopus (Thaumoctopus mimicus) on the sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Mimic Octopus (Thaumoctopus mimicus) swimming along the sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Mimic Octopus (Thaumoctopus mimicus) on the sea bed. 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 octopus / veined octopus (Octopus marginatus) in a shelter made from a broken bottle and sealed with a large sea shell. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / veined octopus (Octopus marginatus) in a shelter made from a broken bottle and sealed with a large sea shell. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Mimic octopus (Thaumoctopus mimicus) head and body, seen from above. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Atlantic longarm octopus (Octopus defilippi) well-camouflaged on the sea bed. Lembeh Strait, North Sulawesi, Indonesia

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

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

Jurgen Freund / Coconut / Veined octopus (Octopus marginatus) "walking" on its tentacles. Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Tropical blue-ringed octopus (Hapalochlaena lunulata) hunting. North Raja Ampat, West Papua, Indonesia

Jurgen Freund / Coconut octopus or the veined octopus (Octopus marginatus) ready to flee from its coconut shell home. Lembeh Strait, Sulawesi, Indonesia

Juergen Freund / Wonderpus octopus (Wunderpus photogenicus) with arms spread on the sea bed. Lembeh Strait, Sulawesi, Indonesia

Nick Upton / Oriental Hornet (Vespa orientalis) feeding on a tentacle from a Common Octopus (Octopus vulgaris) as it hangs in the sun to tenderise. Skala Sikaminia harbour, Lesbos / Lesvos, Greece, August.

Nick Upton / Oriental Hornet (Vespa orientalis) feeding on a tentacle from a Common Octopus (Octopus vulgaris) as it hangs in the sun to tenderise. Skala Sikaminia harbour, Lesbos / Lesvos, Greece, August.

Nick Upton / Common Octopus (Octopus vulgaris) close-up hanging in the sun before cooking. Skala Sikaminia harbour, Lesbos / Lesvos, Greece, August 2010.

Nick Upton / Whole Common Octopus (Octopus vulgaris) and pairs of tentacles hanging in the sun before cooking. Skala Sikaminia harbour, Lesbos / Lesvos, Greece, August 2010.

Nick Upton / Common Octopus (Octopus vulgaris) and Atlantic mackerel (Scomber scombrus) hanging in the sun before cooking. Skala Sikaminia harbour, Lesbos / Lesvos, Greece, August 2010.

Nick Upton / Common Octopus (Octopus vulgaris) and Atlantic mackerel (Scomber scombrus) hanging in the sun before cooking. Skala Sikaminia harbour, Lesbos / Lesvos, Greece, August 2010.

Nick Upton / Oriental hornets (Vespa orientalis) feeding on Common Octopus (Octopus vulgaris) hanging in the sun alongside Atlantic mackerel (Scomber scombrus). Skala Sikaminia harbour, Lesbos / Lesvos, Greece, Au...

Kevin Schafer / Marine otter (Lontra felina) struggling with Octopus in tidepool, Chiloe Island, Chile, Endangered species

Georgette Douwma / Common reef / Day octopus (Octopus cyanea) hunting amongst anemones and featherstars on coral reef. Komodo National Park, Indonesia.

Georgette Douwma / Common reef / Day octopus (Octopus cyanea) pair mating on wreck. Egypt, Red Sea.

Kevin Schafer / Marine Otter (Lontra felina) female carrying octopus, Chiloe Island, Chile

Kevin Schafer / Marine Otter (Lontra felina) female eating octopus on shore, Chiloe Island, Chile

Kevin Schafer / Marine Otter (Lontra felina) carrying octopus, Chiloe Island, Chile

Kevin Schafer / Marine Otter (Lontra felina) carrying large octopus, Chiloe Island, Chile

Georgette Douwma / Day / Common reef octopus (Octopus cyanea) hunting on coral reef amongst featherstars and a sea apple. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Day octopus (Octopus cyanea) hunting on coral reef amongst Featherstars. Komodo National Park, Indonesia.

Georgette Douwma / Day / Common reef octopus (Octopus cyanea) pair mating on coral reef amongst Featherstars and a sea apple. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Day / Common reef octopus (Octopus cyanea) hunting over coral reef. Rinca, Komodo National Park, Indonesia.

Pete Oxford / Day octopus (Octopus cyanea) North Stradbroke Island. Off Queensland coast. Australia

Jeff Rotman / Wild Bottlenose dolphin (Tursiops truncatus) playing with Reef octopus (Octopus cyanae), Nuweiba, Egypt, Red Sea.

GEORGETTE DOUWMA / Common reef / Day octopus (Octopus cyanea) hunting over corals. Andaman Sea, Thailand.

Sue Daly / Giant Pacific octopus (Octopus / Enteroctopus dofleini) on seabed, Pacific ocean, Canada, August

Georgette Douwma / Veined octopus (Octopus marginatus). This octopus can bury in sand or mud but frequently hides in large shells or pieces of discarded coconut shells, or as in this case, discarded bottles. When it is...

Georgette Douwma / Veined octopus (Octopus marginatus). This octopus can bury in sand or mud but frequently hides in large shells or pieces of discarded coconut shells, or as in this case, discarded bottles. When it is...

GEORGETTE DOUWMA / Common reef octopus (Octopus cyanea) showing camouflage on coral reef. Philippines, Indo-Pacific.

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting for prey over sandy seabed, one arm is investigating a burrow for prey, Lembeh Strait, North Sulawesi, Indonesia.

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting for prey over sandy seabed, Lembeh Strait, North Sulawesi, Indonesia.

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting over sandy bottom, investigating burrows and spreading skin between its arms to form a tent to prevent any prey from escaping, Lembeh Strait, North Sulawe...

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting over sandy bottom. Lembeh Strait, North Sulawesi, Indonesia

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting over sandy bottom, Lembeh Strait, North Sulawesi, Indonesia.

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting for prey over sandy seabed. One arm is investigating a burrow, while the skin between the other arms is streched to form a 'tent' to prevent any prey escap...

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting for prey over sandy seabed. Lembeh Strait, North Sulawesi, Indonesia

GEORGETTE DOUWMA / Mimic octopus (Thaumoctopus mimicus) hunting over sandy seabed, Lembeh Strait, North Sulawesi, Indonesia