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(a) Blue-ringed octopus, Hapalochlaena lunulata, well camouflaged in a laboratory tank. Note the muted iridescent blue rings. (b) Bright blue iridescence is typically seen when a blue-ringed octopus flashes its rings. (c) Electron micrograph of the blue rings, showing closely packed iridophore plates (scale bar, 1 μm).
