Two Black Headed Gulls (IMAGE)

University of Bristol

Two Black Headed Gulls

Caption

Photos of two black headed gulls viewed against the clear sky showing how when viewed in intensity (ie brightness) [left] the bird can appear either lighter or darker than the background but when viewed in polarisation [right] the contrast is always the same thus providing a more reliable source of information

Credit

Sam Smithers, University of Bristol

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The image is for single use, should be credited and should not be archived

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