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September 7 2012
Deep-sea crabs have a type of colour vision despite living up to 1000m below the surface, say scientists.
Investigating the "murky depths", US-based researchers recorded the glow of tiny bioluminescent species using a submersible vehicle.
The team also studied how crustaceans react to this light, and found previously unknown sensitivities to blue and ultra violet wavelengths.
They suggest crabs use their colour vision to discern edible food.
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