The giant squid in Finding Dory is bioluminescent. In truth, it is unknown if giant squid are even able to create bioluminescence as they do not have photophores (the light-producing organs many bioluminescent creatures have). They do, however, have the ability to change color using chromatophores, as all squid and octopuses do. The giant squid in Finding Dory is also a mixture of blacks and blues, likely to make it appear more alien and menacing. In reality, giant squids, while able to change color like octopi, are actually brick red (the red color helps hide them in dark water as it makes them harder to see) and can turn white. They also shine a bright gold or silver color when light hits them, as evidenced by Tsunemi Kubodera when he filmed one in 2013.

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