Birds perceive 'warm' colors differently from 'cool' ones

Birds may not have a word for maroon. Or burnt sienna. But show a zebra finch a sunset-colored object, and she'll quickly decide whether it looks more 'red' or 'orange.' A new study shows that birds mentally sort the range of hues on the blue-green side of the spectrum into two categories too, but the line between them is fuzzier, perhaps because 'either/or' thinking is less useful in this part of the spectrum, researchers say.

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