Chameleons have spiral optic nerves, CT scans and 3D modelling reveal. The discovery explains how the lizards can literally keep an eye out for prey in almost every direction, moving their eyeballs as if each has a mind of its own. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Chameleons are most famous for their capacity to mimic the colors of their environment, but the next best-known chameleon fact might be that they possess bulging eyes that move independently. Clearly their camouflage isn’t that good, because not only have humans spotted them for millennia, but even ancient Greek philosophers were aware of the way their eyeballs move, and sought to explain it.

Yet only now has the answer been revealed, in the form of a looping

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