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Mimicry is an intuitive example of adaptive evolution by natural selection: one species (the mimic) evolves to resemble another species (the model) to reduce predation risk, to increase the success in capturing prey, or to gain access to other resources, such as mating opportunities. Whilst mimics are ubiquitous in nature, there are very few examples of mimics that can actively change their body coloration to switch their mimic colours ‘on’ and ‘off’, or to resemble multiple model species. However, we have investigated two intriguing examples of colour change in coral reef fish mimicry systems.