A pair of scientific papers has identified the same single gene as the source of red colouring in birds. The gene makes an enzyme that lets the birds convert yellow pigments, which they eat, into red ...
Cuttlefish can change colour in 200 milliseconds, as fast as a human can blink. Cuttlefish have W-shaped pupils, which are thought to help control the intensity of light entering the eye. Cuttlefish ...
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