Glowing green sharks swim in the dark depths of the ocean thanks to an entirely different kind of biofluorescence than other marine animals. Previously, researchers knew that some shark species ...

The human brain emits a faint glow. New research shows this light reflects mental state - and could lead to new diagnostic ...

Why Walleye Eyes Reflect Light in Photos You’ve no doubt seen the eye of a walleye turn glassy white in photos or when a light shines on it. And you’ve certainl ...

New footage from National Geographic researcher David Gruber and his team reveals a shark glowing bright green 120 feet deep in Scripps Canyon off the coast of Southern California.

Flashlight fish favor dark environments like caves and overhangs. In those conditions, they end up looking like a pair of spooky glowing eyes with no body, as in the video above.

In cats, the tapetum most often glows yellow-green or yellow-orange, but the color varies, just like their irises – the colorful part of their eye, which can be green, yellow, blue or golden.

While reindeer no longer live in our backyards, if they ever happen to be flying by, watch for their luminous blue eyes. It turns out they probably don’t really need a glowing red nose to see ...

Two 110 million-year-old spiders with eyes that still glow in the dark have been discovered trapped in shale at a fossil site in South Korea. The two specimens found belong to an extinct spider ...