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Comparing: Parrots Think They’re So Smart. Now They’re Bartering Tokens for Food.
https://www.nytimes.com/2018/09/11/science/what-makes-parrots-so-smart.html
Pink: Archived September 11, 2018 at 2:59am EDT
Green: Archived September 11, 2018 at 5:46am EDT
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