Deep-sea crabs grab grub using UV vision: Some crabs on the sea floor can see UV light and use the ability to select healthy food

Posted by on 6 September, 2012
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Crabs living half-a-mile down in the ocean, beyond the reach of sunlight, have a sort of color vision combining sensitivity to blue and ultraviolet light. Their detection of shorter wavelengths may give the crabs a way to ensure they grab food, not poison....
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