News Pick
How Do Octopuses Change Colour?
Discover how octopuses use special skin cells to change colour, communicate, and blend seamlessly into their surroundings
Imagine if you could change your skin colour in the blink of an eye—blend into your surroundings like a chameleon, or even glow in the dark! Sounds like something out of a superhero movie, right? Well, for octopuses, this is just another ordinary day in the ocean.
The Science Behind Their Magic
Octopuses are masters of disguise, and their ability to change colour is thanks to special cells in their skin called chromatophores. These tiny, elastic sacs are filled with different coloured pigments—red, yellow, brown, or black. When an octopus wants to change colour, its brain sends signals to muscles around these chromatophores, making them expand or contract. This controls how much of each pigment is visible, instantly shifting the octopus’s appearance!
But wait, there’s more! Beneath the chromatophores, octopuses also have iridophores and leucophores, which reflect and scatter light. These cells allow octopuses to shimmer with metallic blues, silvers, and even glow under different lighting conditions!
Why Do They Change Colour?
Octopuses don’t change colour just for fun—they have serious reasons for their wardrobe transformations:
Camouflage: The ocean can be a dangerous place, with predators like sharks and bigger fish always on the lookout for a meal. By blending into their surroundings, octopuses can hide in plain sight!
Communication: Octopuses are known to flash bright colours when they’re excited, scared, or even angry! A bright red octopus might be sending a warning, while a pale or white one could be feeling threatened.
Temperature Control: Scientists believe that colour changes might even help octopuses regulate their body temperature, keeping them comfortable in varying underwater conditions.
Did You Know?
Octopuses are colorblind! Yes, despite their incredible colour-shifting abilities, they don’t see colors the way humans do. Instead, they rely on other visual cues, like light polarisation, to understand their environment.
The mimic octopus takes camouflage to the next level—it can imitate the shapes and movements of other sea creatures, like a flounder, a lionfish, or even a sea snake!
Some octopuses can change texture as well as colour, making their skin look rough or smooth to match rocks, coral, or sand.
