Chameleons do not change color to hide; they use physics to signal their emotions
In short: Forget the myth that chameleons shift hues to blend into their surroundings. In reality, their baseline state is already camouflaged. When they change color, they are actually engaging in a complex display of communication, using internal crystal structures to broadcast their moods, territorial warnings, or romantic intentions to other chameleons.
For years, scientists incorrectly believed that chameleons changed color by dispersing pigments within their skin, similar to the mechanisms used by cephalopods like octopuses. However, evolutionary geneticist Michel Milinkovitch and his team at the University of Geneva debunked this theory. They noted that while many chameleons appear green, they possess no green pigment in their skin. Instead, the color-changing process, known as metachrosis, relies on the manipulation of light through microscopic structures.
Beneath the epidermis—which contains yellow xanthophores and red erythrophores—lies a layer of iridophores. These cells house nanoscale salt crystals arranged in a triangular lattice, similar to oranges stacked in a display. When light strikes this lattice, specific wavelengths are reflected while others are absorbed. For instance, what we perceive as green is actually blue light reflecting off these crystals and passing through the yellow pigment layer. The chameleon does not change the amount of pigment; it changes the spacing between these crystals.
By applying pressure and chemicals to skin samples, researchers discovered that chameleons can 'tune' their skin by altering the distance between these crystals. As the spacing increases, the reflected light shifts through the spectrum from blue to green, yellow, orange, and red. This kaleidoscopic transition occurs when the animal is agitated or amorous. Furthermore, a second, deeper layer of iridophores reflects infrared light, suggesting that these reptiles also utilize their unique skin architecture to regulate body temperature, helping these cold-blooded creatures manage solar heat absorption.
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Sources
- Summary by Intellect · source: Nature's Mood Rings: How Chameleons Really Change Color | Deep Look
- Also: Chameleon Colors Reflect Their Emotions
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