dpolicar: (Default)
dpolicar ([personal profile] dpolicar) wrote in [personal profile] aroraborealis 2009-11-16 04:56 pm (UTC)

a human will perceive as black what many birds will perceive as ultra-violet

The more I think about this phrase, the less sure I am that I know what it means.

The closest I come is that many birds distinguish via UV perception among colors that humans perceive as black.

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