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Two closely related species living together need different colours to stand out. The Reticulated Butterflyfish (left) & Meyer's Butterflyfish (right) are close relatives that have overlapping ranges in Indo-Pacific and are both found on Great Barrier Reef
© Tane Sinclair-Taylor
Mystery of colour patterns of reef fish solved!
Scientists have solved the mystery of why some closely-related species of an iconic reef fish have vastly different colour patterns, while others look very similar.