BIOLUMINESCENCE

The squid, and many other deep sea creatures, use their bioluminescence to light up the underside of their body with a dim glow — a strategy called counter illumination — to disguise themselves from predators below.Normally a predator would look up and see the dark shadow of the squid blocking the light from the surface. But the glow illuminates the animal to match the light coming from above, effectively rendering it invisible.

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Author: Temy Loing
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