Australian National University conservation geneticist George Olah and his colleagues recently studied feathers from a headdress in a Ychsman noble’s tomb, dating to 1100–1400 CE (the centuries before the rise of the Inca Empire). DNA and chemical isotopes reveal that the parrots the feathers came from (still bright blue, yellow, and green after all these centuries) were born in the wild on the far side of the Andes but kept in captivity somewhere on the Peruvian coast. To pull off importing live parrots from hundreds of miles away across the steep, towering Andes, the Ychsma (who the Inca annexed around 1470) must have had a far-reaching trade network that spanned at least half a continent.
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