Why do octopuses change color so quickly?

Octopus skin contains chromatophores, iridophores, and leucophores, which together can create rapid changes in color and texture. The animal’s brain controls these cells directly, allowing it to match rocks, coral, sand, or even mimic patterns almost instantly. This is especially useful because octopuses are soft-bodied and rely on hiding rather than armor. The common octopus and the mimic octopus are famous for these abilities, with the mimic octopus described scientifically in 1998. Color change is not only camouflage; it can also signal stress, aggression, or mating readiness.