Are sharks colour blind?

Sharks are unable to distinguish colours, even though their close relatives rays and chimaeras have some colour vision, according to new research by Dr Nathan Scott Hart and colleagues from the University of Western Australia and the University of Queensland in Australia. Their study shows that although the eyes of sharks function over a wide range of light levels, they only have a single long-wavelength-sensitive cone type in the retina and therefore are potentially totally colour blind. Hart and team's findings are published online in Springer's journal Naturwissenschaften - The Science of Nature...

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