What the study found
The study found that feathers from Amazonian parrots in an elite tomb at Pachacamac came from four distinct parrot species and were likely obtained through a managed pre-Inca trade network across the Andes. The authors also report that the birds were transported alive to the coast and kept there before the feathers were used.
Why the authors say this matters
The authors conclude that the findings reveal a sophisticated trade network operated by the Ychsma through intermediaries. The study suggests this challenges views of pre-Inca regionalism and shows that ancient exchange can be traced with a multidisciplinary approach.
What the researchers tested
The researchers examined feathers recovered from an intact elite masonry tomb at Pachacamac, a coastal religious center associated with the Ychsma culture during the Late Intermediate Period (about 1000-1470 CE). They combined ancient DNA, stable isotope analysis, and spatial modeling, including species distribution models of ancient habitats and landscape resistance modeling.
What worked and what didn't
Genomic data identified Ara macao, A. ararauna, A. chloropterus, and Amazona farinosa, and the high genetic diversity indicated the birds came from wild populations rather than local breeding. Stable carbon and nitrogen isotope analysis showed a C4-rich coastal diet, which the authors interpret as evidence that the birds were alive on the coast after transport across the Andes. By combining habitat and landscape models, the researchers identified specific trans-Andean corridors used for the exchange.
What to keep in mind
The summary does not describe formal limitations or uncertainties beyond the methods used. The findings are based on feathers from one intact elite tomb at Pachacamac and on the evidence available from that context.
Key points
- Feathers in an elite tomb at Pachacamac were linked to four Amazonian parrot species.
- Ancient DNA showed high genetic diversity, pointing to wild birds rather than local breeding.
- Isotope analysis suggested the parrots ate a C4-rich coastal diet after being transported alive.
- Spatial models identified specific trans-Andean corridors used for the exchange.
- The authors describe the exchange as a managed trade network operated by the Ychsma through intermediaries.
Disclosure
- Research title:
- Ancient feathers show a managed trans-Andean parrot trade
- Authors:
- George Olah, Pere Rosselló Bover, Bastien Llamas, Holly Heiniger, Rafael Segura Llanos, Izumi Shimada
- Institutions:
- Australian National University, King's College London, Universidad de Zaragoza, Fundacion Agencia Aragonesa para la Investigacion y el Desarrollo, Institute for Urban Indigenous Health, The University of Adelaide, Universidad Antonio Ruiz de Montoya, Southern Illinois University Carbondale
- Publication date:
- 2026-03-10
- OpenAlex record:
- View
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