“'The whole point of colour vision is not to inspire poets, but to allow contrast detection,' says Russell Foster, professor of circadian neuroscience at the University of Oxford. 'You’ve got a much better chance of detecting an object against a background if you have colour vision.' Birds are the masters at this, he says – they are tetrachromatic, having four colour detectors, and would see things that we see as a single red as an infinite, glorious wash of colours."
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