Pacific Ocean
The largest and deepest of the oceans, home to the Mariana Trench.
Giant hadal amphipod
Hirondellea gigas
Giant hadal amphipod
A scavenging crustacean that thrives in the total darkness of the ocean's deepest point, able to digest even sunken wood thanks to a unique enzyme.
🌊 6800–10935 m
- ⚡ Lives down to nearly 10,935 m, one of the deepest-living animals known on Earth
- ⚡ Produces an enzyme (cellulase) able to digest sunken wood, an exceptional ability for a crustacean
Humpback whale
Megaptera novaeangliae
Humpback whale
Famous for its spectacular breaches out of the water and its complex songs that can last for hours, it undertakes one of the longest migrations known in any mammal every year.
🌊 0–200 m
- ⚡ Songs that can last for hours and spread from one population to another
- ⚡ Hunts in groups using a coordinated bubble net, a rare technique among whales
Hermit crab
Coenobita sp.
Hermit crab
Unable to build its own shell, it spends its life squatting in abandoned ones, trading up for a bigger one as it grows — sometimes in genuine collective exchange chains.
🌊 0–10 m
- ⚡ Can organise a shell-exchange chain among several individuals of different sizes
- ⚡ Some species live almost entirely on land while still depending on the ocean to reproduce
Sperm whale
Physeter macrocephalus
Sperm whale
The unwitting hero of the novel Moby-Dick and centuries of sailors' legends of titanic battles against monsters of the deep, the sperm whale does indeed fight real duels with the giant squid, whose sucker scars it often carries on its skin.
🌊 0–2000 m
- ⚡ Often carries sucker scars on its skin left by battles with giant squid
- ⚡ Among the deepest divers of all marine mammals, beyond 2,000 m, on a single breath for over an hour
Humboldt squid
Dosidicus gigas
Humboldt squid
Nicknamed the "red devil" for its shifting colour and aggression during group hunts, it can hunt in shoals of several hundred and communicates by rapidly changing colour.
🌊 0–1200 m
- ⚡ Changes colour in a fraction of a second, probably to coordinate group hunting
- ⚡ Tolerates extremely oxygen-poor zones inaccessible to most of its predators
Sea cucumber
Holothuria sp.
Sea cucumber
A true vacuum cleaner of the seafloor, continuously recycling sand and sediment — some species defend themselves by expelling their own internal organs at an attacker.
🌊 0–1000 m
- ⚡ Can expel its own internal organs to repel a predator, then regenerate them entirely
- ⚡ Recycles a considerable amount of marine sediment every year, an essential ecological role
Yeti crab
Kiwa hirsuta
Yeti crab
Discovered only in 2005 near Easter Island, this deep-sea crab literally farms bacteria on its hairy claws to feed on them.
🌊 1500–2500 m
- ⚡ Literally farms bacteria on its own claws to feed on them
- ⚡ Can form extremely dense aggregations, several hundred individuals per square metre
Peacock mantis shrimp
Odontodactylus scyllarus
Peacock mantis shrimp
A reef crustacean able to strike with such speed and force that it can crack an aquarium's glass — one of the fastest movements in the animal kingdom.
🌊 0–40 m
- ⚡ One of the fastest, most powerful strikes in the animal kingdom (acceleration comparable to a bullet)
- ⚡ Unique vision able to perceive polarised light and ultraviolet
Crown-of-thorns starfish
Acanthaster planci
Crown-of-thorns starfish
Able to devour an entire coral reef within months during massive outbreaks, it is also one of the few starfish with genuinely venomous spines.
🌊 0–30 m
- ⚡ Can regenerate a whole individual from a fragment of its body
- ⚡ Can devour an entire coral reef within months during a massive outbreak
Sunflower sea star
Pycnopodia helianthoides
Sunflower sea star
One of the largest starfish in the world, able to move surprisingly fast thanks to more than 15,000 tube feet, but today decimated by over 90% by a mysterious disease.
🌊 0–120 m
- ⚡ Can have up to 24 arms and more than 15,000 tube feet
- ⚡ One of the fastest starfish known, over a metre per minute
Great white shark
Carcharodon carcharias
Great white shark
An iconic apex predator able to leap clean out of the water to surprise prey, and to cover thousands of kilometres on transoceanic migrations still poorly understood.
🌊 0–1200 m
- ⚡ Can leap entirely out of the water to surprise prey at the surface
- ⚡ Ultra-fine electroreception via hundreds of ampullae of Lorenzini
Bargibant's pygmy seahorse
Hippocampus bargibanti
Bargibant's pygmy seahorse
No bigger than a fingernail, this tiny seahorse lives exclusively on a single species of soft coral, whose colour and bumps it mimics perfectly.
🌊 10–40 m
- ⚡ Camouflage so perfect it was discovered by accident, in a lab, on coral already collected for study
- ⚡ The male carries and hatches the eggs, one of the rare parental-role reversals in the animal kingdom
Box jellyfish
Chironex fleckeri
Box jellyfish
Considered one of the most venomous creatures in the sea, its tentacles carry a venom able to trigger cardiac arrest in humans within minutes.
🌊 0–20 m
- ⚡ Has up to 24 eyes, some able to form a true image
- ⚡ One of the fastest, most potent venoms in the animal kingdom
Chambered nautilus
Nautilus pompilius
Chambered nautilus
A true living fossil whose shape has barely changed in over 500 million years, it navigates using a chambered shell that works like a natural submarine.
🌊 0–700 m
- ⚡ A shape virtually unchanged for over 500 million years
- ⚡ Regulates its depth like a submarine, using a shell with gas-filled chambers
Orca
Orcinus orca
Orca
The largest dolphin in the world and such a sophisticated apex predator that some populations develop hunting techniques passed down culturally from generation to generation.
🌊 0–500 m
- ⚡ Develops hunting techniques unique to each population, passed down culturally
- ⚡ A distinct vocal repertoire per family group, a form of dialect
Northern fur seal
Callorhinus ursinus
Northern fur seal
Able to sleep at sea by folding its flippers out of the water like sails, it spends nearly ten months a year at sea, far from any coast.
🌊 0–200 m
- ⚡ Can sleep at sea by folding its flippers out of the water like sails
- ⚡ The densest fur in the animal kingdom, up to 300,000 hairs per square centimetre
Blue-ringed octopus
Hapalochlaena lunulata
Blue-ringed octopus
Tiny and unassuming, it is one of the most venomous animals in the sea: its fluorescent blue rings are a warning to be taken very seriously.
🌊 0–20 m
- ⚡ Venom (tetrodotoxin) among the most powerful in the animal kingdom, with no known antidote
- ⚡ Bioluminescent-style rings that can flash in a fraction of a second
Dumbo octopus
Grimpoteuthis sp.
Dumbo octopus
The cephalopod observed at the greatest depths ever recorded: it owes its name to its two ear-shaped fins reminiscent of the Disney elephant.
🌊 1000–7000 m
- ⚡ The cephalopod observed at the greatest depths ever recorded, down to about 7,000 m
- ⚡ Swims by flapping two ear-shaped fins, a technique unique among octopuses
Clownfish
Amphiprion ocellaris
Clownfish
Immune to the venom of the anemone that hosts it, it spends its entire life in one spot, and can literally change sex if the group's female disappears.
🌊 1–15 m
- ⚡ Immune to the anemone's stinging tentacles thanks to a protective mucus
- ⚡ Sequential hermaphroditism: born male, can become the dominant female
Pufferfish (fugu)
Takifugu rubripes
Pufferfish (fugu)
As famous as a Japanese delicacy as it is feared as a poison, its preparation in the kitchen is reserved for specially certified chefs, since its toxin can be fatal if a mistake is made.
🌊 0–50 m
- ⚡ Can double in size within seconds by swallowing water
- ⚡ A toxin so powerful that its culinary preparation requires specific certification in Japan
Mariana snailfish
Pseudoliparis swirei
Mariana snailfish
The deepest-living fish ever confirmed, discovered in 2014 and formally described in 2017 in the Mariana Trench, at nearly 8,000 m below the surface.
🌊 6198–8076 m
- ⚡ The deepest-living fish ever confirmed, down to about 8,000 m
- ⚡ Its cells are protected from being crushed by a molecule (TMAO) that stabilises its proteins under extreme pressure
Lionfish
Pterois volitans
Lionfish
As spectacular as it is fearsome, its long venomous fan-like fins conceal a species that has become one of the greatest invasive threats to Caribbean reefs.
🌊 0–50 m
- ⚡ Venomous fins fanned out to intimidate and defend itself
- ⚡ A voracious appetite that fuelled a record invasion of the Atlantic and the Caribbean
Stonefish
Synanceia verrucosa
Stonefish
Considered the most venomous fish in the world, it blends perfectly with rocks and dead coral, making it nearly impossible to spot until it's too late.
🌊 0–30 m
- ⚡ Near-perfect camouflage, blending in with an algae-covered rock
- ⚡ One of the most powerful venoms known in any fish
Giant Pacific octopus
Enteroctopus dofleini
Giant Pacific octopus
Long feared as the "devilfish" in the legends of Indigenous peoples of the North American Pacific coast, this largest known octopus in the world turns out to be remarkably intelligent, able to open jars and recognise individual humans.
🌊 0–1500 m
- ⚡ Has nine brains, one central and one in each of its eight arms, able to act almost independently
- ⚡ Intelligence documented in the lab: able to open jars and recognise certain individual humans
Mimic octopus
Thaumoctopus mimicus
Mimic octopus
Able to imitate the appearance and behaviour of some fifteen different species, including venomous fish and sea snakes, to fool its predators.
🌊 0–25 m
- ⚡ Able to imitate the appearance of about fifteen different species, including venomous fish
- ⚡ Chooses which species to mimic based on the predator detected nearby
Giant oarfish
Regalecus glesne
Giant oarfish
In Japan it is nicknamed the "messenger from the palace of the dragon god", and its appearance near the coast is sometimes seen as an omen of an imminent earthquake — a legend science has never confirmed but which likely explains the origin of many sea-serpent tales.
🌊 20–1000 m
- ⚡ Can swim in a perfectly vertical, motionless position, rippling only its dorsal fin
- ⚡ Its rare, spectacular strandings have fuelled the sea-serpent legend for centuries
Megamouth shark
Megachasma pelagios
Megamouth shark
So rare it was only discovered in 1976, with fewer than 100 individuals observed since, despite reaching over 5 metres in length.
🌊 12–250 m
- ⚡ A species discovered only in 1976, one of the major zoological discoveries of the 20th century
- ⚡ A mouth that can open over a metre wide to filter plankton
Goblin shark
Mitsukurina owstoni
Goblin shark
Nicknamed the "alien shark", it projects its jaws out of its head at blinding speed to catch prey — one of the strangest attacks in the animal kingdom.
🌊 100–1300 m
- ⚡ Can project its jaws out of its head in a fraction of a second to catch prey
- ⚡ Detects prey via electrical sensors spread across its long snout
Scalloped hammerhead shark
Sphyrna lewini
Scalloped hammerhead shark
Its hammer-shaped head, the cephalofoil, is an extraordinary biological radar, studded with electrical sensors able to detect prey buried in the sand.
🌊 0–80 m
- ⚡ Ultra-sensitive electroreception via ampullae of Lorenzini spread across its cephalofoil
- ⚡ Near-360° panoramic vision
Tiger shark
Galeocerdo cuvier
Tiger shark
Nicknamed "the wastebasket of the sea" for its extraordinarily opportunistic diet, it has been known to swallow objects as improbable as licence plates or tyres.
🌊 0–350 m
- ⚡ The most varied diet known in any shark, including non-food objects
- ⚡ Teeth able to slice through the shell of an adult sea turtle
Giant triton
Charonia tritonis
Giant triton
Named after Triton, the sea's messenger god in Greek mythology who blew a conch shell to calm or unleash the waves, this huge sea snail is also one of the few natural predators able to keep crown-of-thorns starfish outbreaks in check on coral reefs.
🌊 0–30 m
- ⚡ One of the only natural predators able to keep devastating crown-of-thorns starfish outbreaks in check
- ⚡ Its shell has served for millennia as a ceremonial wind instrument in many Pacific cultures
Giant tube worm
Riftia pachyptila
Giant tube worm
Lacking a mouth, stomach or anus, it lives entirely thanks to symbiotic bacteria that convert the toxic hydrogen sulfide of hydrothermal plumes into energy.
🌊 1500–2500 m
- ⚡ Lives without a mouth or stomach, entirely nourished by internal symbiotic bacteria
- ⚡ Its hemoglobin carries both oxygen and a deadly poison without harm, a unique biochemical feat