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Blackback butterflyfish
The blackback butterflyfish (Chaetodon melannotus) is a species of butterflyfish found in the Red Sea, Indian Ocean, and western Pacific Ocean. When observed at night or when frightened, this species changes color; the dorsal portion of the body turns black except for two white patches. These oviparous fish are common on staghorn coral thickets, at depths of 4 to 20 m (13 to 66 ft).Photo: Leonard Low/PLW

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