FILE - In this Sept. 26, 1997, file photo, a handler holds Tuatahi, a 3 week old Kiwi bird, the first kiwi born at Sydney's Taronga Zoo for more than 26 years. Scientists say they have sequenced the ...
image: While humans have three color cones in the retina sensitive to red, green and blue light, birds have a fourth color cone that can detect ultraviolet light. A research team led by Princeton's ...
11monon MSN
Birds-of-paradise are sending secret color signals invisible to human eyes, scientists say
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