(By Phys.org)– Researchers have long assumed that some animals could see through this silvery disguise, thanks to a superpower of their own: the ability to detect a property of light—called polarization—that humans can’t see. Octopuses and squid, shrimp and other crustaceans, and some fish such as trout and salmon all have the gift, called polarization vision.
“It’s kind of like wearing polarized sunglasses,” said Sonke Johnsen, biology professor at Duke University and the first author on a new study of how well animals see reflective camouflage in the ocean. The polarization state of light changes when it bounces off a silvery fish’s shiny scales. Scientists long presumed that this makes it easier for animals with polarization vision to make silvery fish out against the background, to eat them or avoid them.But the newly released findings suggest otherwise.
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