Cephalopods · Ocean Life & Myths

🦑 GLASS SQUID

Cranchiidae · ~60 species

Drifting silently through the twilight zone, the glass squid is nature's living crystal. Almost invisible in the deep, it carries every secret of its strange biology on full display.

Transparent glowing body — almost completely see-through, with bioluminescent organs lighting up its silhouette
Food travels right through their brain — the esophagus literally passes through the donut-shaped brain on its way to the stomach
THREE hearts — one main systemic heart plus two branchial hearts pumping blood through the gills
Can turn completely black in a flash — special pigment cells flood the body to vanish into the darkness when threatened

🐙 OCTOPUS

Octopoda · over 300 species

Eight arms, three hearts, blue blood, and a brain in every limb — the octopus is so alien it has been called the closest thing to intelligent life from another planet.

8 arms with hundreds of suckers — each sucker can taste, grip, and even smell what it touches
3 hearts and blue blood — one main heart pumps to the body, two more push blood through the gills; a copper-based blood pigment makes it blue
Super intelligent — solves puzzles, opens jars, escapes tanks, and even uses tools like coconut shells for armour
Can change color instantly — special skin cells called chromatophores fire in milliseconds to camouflage, communicate, or warn

🦑 GIANT SQUID

Architeuthis dux

For centuries it was a sailor's tale — a colossal beast lurking in the deep, dragging ships beneath the waves. The Giant Squid is real, and almost as strange as the legend.

Biggest eyes of any animal on Earth — up to 27 cm across, each the size of a dinner plate, perfect for spotting tiny flickers of light in the abyss
Lives in the deep ocean — patrols the cold midnight zone hundreds to thousands of metres below the surface
Rarely seen alive — was never filmed in its natural habitat until 2012; almost everything we know comes from washed-up bodies
Can stretch up to 13 metres long from mantle tip to feeding-tentacle tip

🦑 COLOSSAL SQUID

Mesonychoteuthis hamiltoni

Heavier than the Giant Squid, armed with rotating hooks instead of plain suckers, the Colossal Squid haunts the freezing waters around Antarctica.

Largest invertebrate alive — weighs up to 750 kg, more massive than any creature without a backbone on the planet
Has rotating hooks, not suckers — its two long feeding tentacles bristle with swivelling claws perfect for gripping struggling prey
Lives deep in the freezing Southern Ocean around Antarctica, mostly below 1,000 m
Locked in an ancient battle with sperm whales — circular sucker scars cover their attackers' skin

🐚 NAUTILUS

Nautilidae · 6 living species

Hidden inside a perfect spiral shell, the nautilus has drifted through the oceans almost unchanged for nearly half a billion years — a creature older than the dinosaurs.

Living fossil unchanged for 500 million years — its body plan has barely shifted since long before the first land plants existed
Its shell is a perfect logarithmic spiral — divided into chambers it adjusts with gas to float, sink, or hover
Has up to 90 sticky tentacles — but no suckers, unlike its squid and octopus cousins
The only living cephalopod with an external shell

🦑 CUTTLEFISH

Sepiidae

The artists of the cephalopod world. With skin that paints itself in shimmering patterns and pupils shaped like the letter W, cuttlefish hypnotise prey and predators alike.

Masters of camouflage — fire millions of pigment cells called chromatophores in milliseconds to vanish into any background, even matching textures and patterns
Famous W-shaped pupils for amazing depth perception
Probably colour-blind themselves — yet still match colour perfectly using polarised light
Some hypnotise prey with shifting black-and-white waves rolling across their skin

🐙 THE KRAKEN 🐙

Largest. Oldest. Most terrifying of all…

Some say it was just a sailor's nightmare. Others say it still waits in the lightless trench, eight massive arms ready to drag the world below the waves. The legendary Kraken has terrified mariners for a thousand years — and the truth may be stranger than the myth.

⟶ MEET THE KRAKEN ⟵