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.
The research, conducted in the Bahamas, is published in two papers in the Journal of Experimental Biology and was undertaken with Professor Sonke Johnsen from Duke University in North Carolina, US, Dr Tamara Frank from Nova Southeastern University in Florida, US and colleagues.
Read more: http://www.bbc.co.uk/nature/19488659
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