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Do seabirds have polarised vision?

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	Why are the cones in our eyes red, green and blue? Why are the cones in our eyes red, green and blue? Why not red, yellow and blue? How can we see yellow? Graham in Norwich
	They're not actually red, green and blue at all, although that's what we tend to call them. They're actually blue, green and yellow. The long wavelength cone absorbs mainly in the yellow and not in the red, so that's how we can see yellow.
	October 2006

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Listen to this as part of the show: 15th Oct 2006 - Science of Sight, Eye Diseases and Animal Vision
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