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mindblowingscience:

Twilight Zone: Glow-in-the-Dark Sharks Need Special Eyes to See

In the “twilight zone” of the deep ocean, strange glowing sharks have evolved eyes that are adapted to see complex patterns of light in the dark, new research reveals.

These bioluminescent sharks have a higher density of light-sensitive cells in their retinas, and some species have even developed other visual adaptations that help them see the glimmering lights they use to signal to each other, find prey and camouflage themselves in this region where little light penetrates, according to a study published today (Aug. 6) in the journalPLOS ONE.

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(via spoonofoil)