Invisible sharks

From Gizmodo:
 Invisible sharks

As if they weren’t scary enough, scientists have discovered that sharks can become invisible to preys using an optical trick. Not scared yet? Well, one of the invisible shark species is nicknamed the phantom hunter of the fjords. Run. Now.

The sharks aren’t really turning invisible. They’re making their bellies glow so that creatures below them won’t see their silhouettes against the sunlight. So you can breathe easy. For now.

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