Birds exploit a wide variety of pigments to produce dramatic effects, and their vivid plumage has always fascinated man. By using the reflective properties of the feather's materials, birds have extended the range of visual effects by creating `structural colours' that produce shimmering iridescent effects. These structural colour effects are produced by reflection, in a similar way to the brightly coloured rings in oily patches. Daniel Osorio realised that although a great deal was known about the pigmented colouring,no one had a systematic understanding of the reflected spectral properties of feathers. If he was going to get any idea of how birds exploited their extended pallet of colours, he had to develop some way of systematically analysing a feather's reflected spectra. Together with graduate student Abi Ham, they built an optical system where they control the feather's orientation under a moving light source to collect the definitive spectral signatures(p....

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