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The Bird Way: A New Look at How Birds Talk, Work, Play, Parent, and Think, by Jennifer Ackerman

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Humans have three types of color-receptive cones in our retinas, blue, green, and red. Birds have a fourth color cone that is sensitive to ultraviolet wavelengths.
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The Bird Way: A New Look at How Birds Talk, Work, Play, Parent, and Think
The Bird Way: A New Look at How Birds Talk, Work, Play, Parent, and Think
by Jennifer Ackerman
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