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Chromatophores from Hawaiian Bobtail Squid

Hawaiian bobtail squid are nocturnal predators, remaining buried under the sand during the day and coming out to hunt for shrimp at night near coral reefs. The squid have a light organ (chromatophore) on their underside that houses a colony of glowing bacteria (Vibrio fischeri). The squid uses this bacterial bioluminescence in a form of camouflage called counter-illumination, masking its silhouett…