Behavioural tests probe ray and shark colour vision

University of Queensland researchers have shown stingrays, once thought to be colour-blind, may be capable of seeing in colour.

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<p><a href="http://www.physorg.com/news95416787.html">Behavioural tests probe ray and shark colour vision</a></p> <p>University of Queensland researchers have shown stingrays, once thought to be colour-blind, may be capable of seeing in colour.</p>