Cuttlefish
Sepia officinalis
Quick answer
The cuttlefish is a marine cephalopod related to squid and octopuses, found in the coastal waters of the eastern Atlantic and Mediterranean. It has eight arms, two longer feeding tentacles, large W-shaped eyes, and an internal shell called the cuttlebone that controls buoyancy. Cuttlefish are among the best camouflage artists in nature, changing color and skin texture in an instant, and they typically live only 1 to 2 years.
Cuttlefish facts at a glance
| Scientific name | Sepia officinalis |
|---|---|
| Diet | Carnivore (fish, crabs, shrimp) |
| Habitat | Coastal seas, sandy seabeds, and seagrass |
| Lifespan | 1–2 years |
| Length | Up to about 50 cm (20 in) including arms |
| Top speed | Up to 25 km/h (16 mph) in a jet burst |
| Conservation status | Least Concern (IUCN) |
| Kingdom | Animalia |
|---|---|
| Phylum | Mollusca |
| Class | Cephalopoda |
| Order | Sepiida |
| Family | Sepiidae |
| Genus | Sepia |
Where it lives
Coastal seas of the eastern Atlantic and the Mediterranean, over sandy and seagrass seabeds.
Camouflage and color change
Cuttlefish can change the color, pattern, and even texture of their skin within a fraction of a second using millions of pigment cells called chromatophores backed by light-reflecting cells. This lets them blend into sand, rock, or seagrass and produce hypnotic moving patterns to confuse prey and rivals. Remarkably, they appear to be colorblind yet still match their surroundings with great accuracy.
Diet and hunting
Cuttlefish are carnivores that hunt fish, crabs, and shrimp, often stalking prey while flashing rippling color patterns that may dazzle or mesmerize it. When close enough, they shoot out two long feeding tentacles tipped with suckers to seize the victim. A sharp, parrot-like beak and venomous saliva then subdue and break down the meal.
The cuttlebone and movement
Inside its body a cuttlefish carries a porous internal shell called the cuttlebone, which it fills with gas and liquid to fine-tune its buoyancy and hover effortlessly. It swims gracefully using a fringe of fins that ripple along the sides of its mantle. For sudden escapes it uses jet propulsion, forcing water through a siphon and often releasing a cloud of dark ink.
Intelligence and life cycle
Cuttlefish are among the most intelligent invertebrates, with large brains, excellent eyesight, and the ability to learn and remember. Like many cephalopods they live fast and die young, usually surviving only one to two years. Adults breed once near the end of their lives, with females laying clusters of eggs before both parents die soon after.
Frequently asked questions about the Cuttlefish
How do cuttlefish change color?
Cuttlefish use millions of tiny pigment cells called chromatophores, along with reflective cells beneath them, to change color and pattern almost instantly. They can also alter their skin texture to match rocks, sand, or seaweed.
Are cuttlefish intelligent?
Yes. Cuttlefish are among the smartest invertebrates, with large brains, sharp vision, and the ability to learn and solve problems. They use complex signals and camouflage to hunt and communicate.
What do cuttlefish eat?
Cuttlefish are carnivores that eat fish, crabs, and shrimp. They catch prey by shooting out two long feeding tentacles and then subdue it with a sharp beak and venomous saliva.
How long do cuttlefish live?
Most cuttlefish live only about 1 to 2 years. They grow quickly, breed once near the end of their lives, and then die soon after reproducing.
Is a cuttlefish a fish?
No. Despite the name, a cuttlefish is not a fish but a cephalopod mollusk, closely related to squid and octopuses. The cuttlebone sold for pet birds is its internal shell.
Are cuttlefish dangerous to humans?
Cuttlefish are generally harmless to people, though they have a beak and venomous saliva used to subdue prey. They are not aggressive and prefer to flee or hide using camouflage and ink.
