Did you know cuttlefish have the most acute polarization vision of any animal? They can detect patterns in light that human eyes can't see. We still have a lot to learn about how they process the underwater world, but one mystery we have solved is their bizarre W-shaped pupils. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Yes, if this is the first time you’re hearing it: cuttlefish have W-shaped pupils . Pretty weird, huh? For years, scientists figured it was either a kind of camouflage or a way of judging distance. Then, a 2012 study revealed all.

In the study, three Sepia officinalis were placed in individual tanks and left unrestrained. Using an infrared camera aimed through a beam splitter, researchers then photogra

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