This article was originally published on Sikho.ai. Read the full guide there.
Cuttlefish are colorblind. Yet they can mimic the color, pattern, and texture of any surface around them — instantly, perfectly, like living LCD screens. How does an animal that cannot see color produce the most sophisticated color displays in nature?
In our full guide on Sikho.ai, we explore the biology in depth.
How They Change Color
Cuttlefish skin contains millions of chromatophores — tiny pigment-filled sacs surrounded by muscles. When the muscles contract, the sac expands and shows color. They can fire these neurally faster than 200ms. Below the chromatophores are iridophores (reflective layer) and leucophores (white scattering layer) that add depth and finesse.
How They Change Texture
Cuttlefish can morph their skin from smooth to bumpy. Tiny muscles called papillae can pop up to mimic seaweed, coral, or rocks. Combined with color changes, the result is camouflage that fools predators within a fraction of a second.
How They See Without Seeing Color
Despite being colorblind, cuttlefish have a unique W-shaped pupil that detects polarization — meaning they see surface orientations and reflective properties. Recent research suggests they may also use chromatic aberration as a depth cue.
Read the complete cuttlefish biology deep-dive on Sikho.ai's blog.
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