How do octopi and squid change color?

The talented octopus and the cuttlefish have clever ways to camouflage themselves, including changing the pattern and texture of their skin to mimic the rocks or coral where they’re hiding. The mimic octopus can actually make itself look like other animals. But squid are out in the open ocean, and need other tricks to hide from predators. So, they put on a special show of color, changing colors and patterns so quickly that it looks like a computer screen saver.

Many thousands of color-changing cells called chromatophores just below the surface of the skin are responsible for these remarkable transformations. The center of each chromatophore contains an elastic sac full of pigment, rather like a tiny balloon, which may be colored black, brown, orange, red or yellow. If you squeezed a dye-filled balloon, the color would be pushed to the top, stretching out the surface and making the color appear brighter—and this is the same way chromatophores work. A complex array of nerves and muscles controls whether the sac is expanded or contracted and, when the sac expands, the color is more visible. Besides chromatophores, some cephalopods also have iridophores and leucophores. Iridophores have stacks of reflecting plates that create iridescent greens, blues, silvers and golds, while leucophores reflect only the colors of the environment, making the animal less conspicuous.

squid skin.jpg.838x0_q80
Pigment in the skin are like little water balloons that expand and contract, allowing squid to put on what looks like a light show over their bodies. (Photo: KQED)

The most obvious reason such a soft-bodied animal would change color is to hide from predators—and octopi are very good at this.

Screen Shot 2017-03-16 at 1.52.28 PM

Screen Shot 2017-03-16 at 1.52.01 PM

They can change not only their coloring, but also the texture of their skin to match rocks, corals and other objects in their surroundings. They do this by controlling the size of projections on their skin (called papillae), creating textures ranging from small bumps to tall spikes. The result is a disguise that makes them nearly invisible; can you even see the octopus in the video above? Color changing is just one tool in an octopus’s arsenal of defenses, however; it can also spray ink, and make a quick escape through any hole it can get its hidden bony beak through.

cuttlefish resting.jpg.653x0_q80_crop-smart
Cuttlefish have one of the most dramatic and beautiful mechanisms for escaping the notice of predators. (Photo: KQED)

 
 
 
RECOMMENDED ARTICLE

Amazing piano stairs from around the world

Amazing piano stairs from around the world
READ MORE >
 
 

US, Japan, South Korea to Hold Missile Tracking Drill Amid North Korea Crisis

US, Japan, South Korea to Hold Missile Tracking Drill Amid North Korea Crisis
The United States, Japan and South Korea will hold two days of missile tracking drills starting on Monday, Japan's Maritime ...
READ MORE >
 

Kim Jong Un Releases Propaganda Photo of Him ‘Climbing’ Sacred Mountain

Kim Jong Un Releases Propaganda Photo of Him ‘Climbing’ Sacred Mountain
North Korea published a series of propaganda photos, claiming that dictator Kim Jong Un climbed a 9,000-foot-tall snow-packed ...
READ MORE >
 

Trump Demands, Gets Apology From Washington Post Reporter

Trump Demands, Gets Apology From Washington Post Reporter
WEST PALM BEACH, Fla.—President Donald Trump has demanded and received an apology from a Washington Post reporter over ...
READ MORE >
 

‘Star Wars: The Last Jedi’ Premieres With Tribute to Late Carrie Fisher

‘Star Wars: The Last Jedi’ Premieres With Tribute to Late Carrie Fisher
Los Angeles—The galaxy far, far away was brought to life in downtown Los Angeles on Saturday for the ...
READ MORE >
 

Adorable duo creates awesome car-remix of ‘Let It Go’

Adorable duo creates awesome car-remix of ‘Let It Go’
Driving with kids is certainly not easy but therefor you have a car radio and can sing with ...
READ MORE >