In fact birds do not. They are thought to see colors better then humans. While humans only have photo-pigments at three peak wavelenghts, birds have photo-pigments that peak at four or five different wavelengths. Some species of birds have an eyesight that even stretches into the ultraviolet spectrum. Birds seem to have a complexity of eyesight that may contain more colors, but is not understood by the human eye. Just as a colorblind person does not know what certain colors would look like for a person who is not colorblind.
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