Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) group gathered for mating, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) male and female, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) males fighting over female, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) males fighting over female, Whyalla, South Australia, Australia

Tony Heald / African wild dog (Lycaon pictus) portrait. Chobe National Park Botswana. Digitally enhanced sepia image.

Sue Daly / Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Sue Daly / Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Sue Daly / Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Sue Daly / Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Niall Benvie / Bealach na Ba Pass, Wester Ross, Scotland, UK, November 2015.

Niall Benvie / Abandoned shelter near Stokkness, Iceland, September 2015.

Niall Benvie / Whisky barrels at Bunnahabhain Distillery looking over to Jura, Islay, Scotland, UK, February.

Pascal Kobeh / Pygmy cuttlefish (Sepia sp.) Indonesia, Sulawesi Sea.

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...

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

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

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

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

Chris Newbert / Cuttlefish (Sepia sp) portrait, 50 feet deep, Papua New Guinea

Fred Bavendam / Australian Giant Cuttlefish (Sepia apama) hatchling swimming past the egg of an unhatched sibling after an incubation of about four months, southern Australia

Fred Bavendam / Australian Giant Cuttlefish (Sepia apama) swimming by some Stalked Ascidians, its skin is relatively smooth and even colored, Jervis Bay, New South Wales, Australia

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

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

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

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

Sergio Hanquet / Cuttlefish (Sepia officinalis) feeding on Scorpionfish (Scorpaenidae). Tenerife, Canary Islands.

Sergio Hanquet / Cuttlefish (Sepia officinalis) feeding on Scorpionfish (Scorpaenidae). Tenerife, Canary Islands.

Franco Banfi / Common cuttlefish (Sepia officinalis) above seabed with diver observing it,. Vis Island, Croatia. 2019.

Doug Perrine / Pharaoh cuttlefish (Sepia pharaonis) pair in courtship, male with stripes. Smaller male in background. Gato Island, off Malapascua, Cebu, Philippines.

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) male and female mating, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) male and female mating, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) males fighting over female, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) pair, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) pair, Whyalla, South Australia, Australia

Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) under pier, Port Phillip Bay, Mornington Peninsula, Victoria, Australia

Gary Bell/ Oceanwide / Flamboyant Cuttlefish (Metasepia pfefferi), Anilao, Philippines

Gary Bell/ Oceanwide / Broadclub Cuttlefish (Sepia latimanus), Milne Bay, Papua New Guinea

Pascal Kobeh / Papuan cuttlefish (Sepia papuensis), Sulu sea, Philippines

Pascal Kobeh / Elegant cuttlefish (Sepia elegans), Canary Islands

Shane Gross / Needle cuttlefish (Sepia aculeata) camouflaged in seabed at night off Anilao, Philippines.

Georgette Douwma / Broadclub cuttlefish (Sepia Latimanus) pair. West Papua, Indonesia. Indo-West Pacific.

Pascal Kobeh / Two Papuan cuttlefish (Sepia papuensis) likely male and female, Sulu Sea, Philippines.

Pascal Kobeh / Two Papuan cuttlefish (Sepia papuensis) likely male and female, Sulu Sea, Philippines.

Pascal Kobeh / Papuan cuttlefish (Sepia papuensis) Sulu Sea, Philippines

Georgette Douwma / Crinoid cuttlefish (Sepia sp) Puerto Galera, Philippines.

Georgette Douwma / Papuan cuttlefish (Sepia papuensis) West Papua, Indonesia.

Linda Pitkin / Cuttlefish (Sepia sp.), Triton Bay, near Kaimana, West Papua, Indonesia

David Fleetham / Broadclub cuttlefish (Sepia latimanus) in translucent egg casing on the reef, Philippines, Asia.

David Fleetham / Broadclub cuttlefish (Sepia latimanus),female placing egg into gap between corals, Philippines, Asia.

David Fleetham / Broadclub cuttlefish (Sepia latimanus) emerging from its egg casing, Philippines, Asia.

David Fleetham / Broadclub cuttlefish (Sepia latimanus) with siphon visible Bali, Indonesia.

David Fleetham / Reef scene with a Broadclub Cuttlefish (Sepia latimanus) Komodo, Indonesia. Two images were digitally stitched together to create this panorama.

David Fleetham / Eye of Papuan cuttlefish (Sepia papuensis). Tulumben, Bali, Indonesia.

David Fleetham / Mating Papuan cuttlefish (Sepia papuensis) Tulumben, Bali, Indonesia.

David Fleetham / Broadclub cuttlefish (Sepia latimanus) on coral reef, Komodo, Indonesia.

David Fleetham / Stumpy spined cuttlefish (Sepia bandensis) feeding on mantis shrimp at night, Rinca Island, Komodo National Park, Indonesia.

David Fleetham / Divers on underwater scooters and a common cuttlefish (Sepia officinalis) in Palau, Micronesia, January 2005. Model released

David Fleetham / Broadclub cuttlefish (Sepia latimanus), Komodo, Indonesia.

Franco Banfi / Broadclub cuttlefish (Sepia latimanus) hunting, Pura Vida House Reef, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.

Franco Banfi / Broadclub cuttlefish (Sepia latimanus) hunting, Pura Vida House Reef, Dumaguete, East Negros Island, Central Visayas, Philippines, Pacific Ocean.

Bert Willaert / Broadclub cuttlefish (Sepia latimanus), Bismarck Sea, Vitu Islands, West New Britain, Papua New Guinea

Constantinos Petrinos / Broadclub cuttlefish (Sepia latimanus) egg laid among the branches of Branching Fire Coral (Millepora sp.) for protection against predators. Lembeh Strait, North Sulawesi, Indonesia.

Sue Daly / Cuttlefish (Sepia officinalis) eating a Seabream (Sparidae), filmed at night, Sark, British Channel Islands, UK, October.

Sue Daly / Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Sue Daly / Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Sue Daly / Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Sue Daly / Close-up of a Common cuttlefish (Sepia officinalis) hunting, filmed at night, Sark, British Channel Islands, UK, August.

Sue Daly / Common cuttlefish (Sepia officinalis) swimming over the seabed, with others in the background, Sark, British Channel Islands, UK, July.

Sue Daly / Common cuttlefish (Sepia officinalis) swimming over the seabed, Sark, British Channel Islands, UK, July.

Georgette Douwma / Papuan cuttlefish (Sepia papuensis) swimming, West Papua, Indonesia.

Tony Wu / Broadclub cuttlefish (Sepia latimanus) Lembeh Strait, North Sulawesi, Indonesia

Tony Wu / Broadclub cuttlefish (Sepia latimanus) resting on the dark sand bottom of the Lembeh Strait in North Sulawesi, Indonesia

Paul D Stewart / Photograph of Charles Darwin taken by Lock & Whitfield in 1877 and published in' Men of Mark' 1878.

Paul D Stewart / Sepia photograph of Herbert Spencer (1820-1903), English philosopher, 1860s. Spencer was a journalist who published his best known work Principals of Psychology in which he applied Darwin's ideas on e...

Georgette Douwma / Papuan cuttlefish (Sepia papuensis) courting pair, West Papua, Indonesia.

Georgette Douwma / Papuan cuttlefish (Sepia papuensis) courting pair. West Papua, Indonesia.

Alex Mustard / Broadclub cuttlefish (Sepia latimanus) hovers in front of an anemone. Balbulol Islands, Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea, Tropical West Pacific Ocean.

Pete Oxford / Broadclub Cuttlefish (Sepia latimanus) in reef, Cenderawasih Bay, West Papua, Indonesia

Niall Benvie / Liathach reflected in the water of Loch Clair at dusk, Wester Ross, Scotland, UK, November.

Georgette Douwma / Broadclub cuttlefish (Sepia latimanus) with a female scuba diver taking its picture. Indonesia.

Onne van der Wal / Yachts racing at dusk in the Sydney Harbor in Sydney, New South Wales, Australia, November 2012. All non-editorial uses must be cleared individually.

Onne van der Wal / Yachts race at dusk in Sydney Harbour, New South Wales, Australia, November 2012. All non-editorial uses must be cleared individually.

Onne van der Wal / Yacht sailing in Sydney Harbour at dusk, New South Wales, Australia, November 2012. All non-editorial uses must be cleared individually.

Onne van der Wal / Yacht racing at dusk in Sydney Harbour, New South Wales, Australia, November 2012. All non-editorial uses must be cleared individually.

Onne van der Wal / Yacht sailing past a lighthouse in front of the Harbour Bridge in Sydney, New South Wales, Australia, November 2012. All non-editorial uses must be cleared individually.

Onne van der Wal / Yacht sailing past the Sydney Opera House at dusk, November 2012. All non-editorial uses must be cleared individually.

Onne van der Wal / Yacht sailing past the Sydney Opera House at dusk, New South Wales, Australia, November 2012. All non-editorial uses must be cleared individually.

Inaki Relanzon / Broadclub cuttlefish (Sepia latimanus) Komodo National Park, Indonesia.

Inaki Relanzon / Broadclub cuttlefish (Sepia latimanus) Komodo National Park, Indonesia.

Inaki Relanzon / Broadclub cuttlefish (Sepia latimanus) Komodo National Park, Indonesia.

Inaki Relanzon / Broadclub cuttlefish (Sepia latimanus) Komodo National Park, Indonesia.

Inaki Relanzon / Broadclub cuttlefish (Sepia latimanus). Komodo National Park, Indonesia.