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From:
Birds, Cornell Lab of Ornithology
(Uncensored)
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Birds’ Vocal Warnings Provide New Insight Into the Origins of Language
https://www.birds.cornell.edu/home/vocal-warnings-origins-of-language/
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Birds separated by vast geographic distances and millions of years of evolution share a remarkably similar learned vocal warning to identify parasitic enemies near their nests, an international team of researchers has found.