Ancient DNA Evidence Reveals Amazonian Parrots Survived Massive Trans-Andean Trade Crossings Centuries Before the Inca Empire

ANU researchers find that Amazonian parrots were traded alive across the Andes 1,000 years ago, surviving on a human diet of maize and seafood on the Peru coast.

By: AXL Media

Published: Mar 11, 2026, 5:55 AM EDT

Source: The information in this article was sourced from Australian National University

Genomic Evidence of Pre-Hispanic Animal Logistics

A landmark study published in Nature Communications has redefined the understanding of ancient South American commerce by proving that Amazonian parrots were transported alive across the Andes long before the rise of the Inca Empire. By analyzing ancient DNA from parrot feathers found at the Pachacamac religious center in Peru, an international team including researchers from the Australian National University (ANU) confirmed that these birds originated in lowland rainforests hundreds of kilometers away. Lead author Dr. George Olah stated that the western side of the Andes was as inhospitable to these species a millennium ago as it is today, making their presence on the Pacific coast a clear indicator of deliberate human intervention. This discovery highlights a level of logistical planning and ecological knowledge previously underestimated in pre-Inca societies.

Mapping the Inhospitable Trans-Andean Corridors

The researchers employed computational landscape modeling to recreate the arduous journey these birds and their captors would have undertaken through rugged mountain passes and steep plateaus. While macaws are native to the lush environments east of the Andes, the study confirmed they were moved over 500 kilometers across one of the world's highest mountain ranges. Because these birds do not naturally fly over such dramatic terrain, their arrival at coastal ritual sites required weeks or even months of overland travel. The genomic analysis identified four specific Amazonian species, including the Scarlet Macaw and the Blue-and-yellow Macaw, all of which are strictly rainforest dwellers with limited natural ranges that would never overlap with the desert coast.

Dietary Shifts and the Evidence of Captivity

Isotope chemistry provided the definitive evidence that the parrots were kept alive long after their removal from the rainforest. By examining the chemical signatures within the feathers, the team discovered a significant shift in the birds' diets from native forest fruits to C4 plants like maize and marine proteins. Dr. Olah explained that the parrots were fed the same nitrogen enriched diet consumed by their human captors, indicating prolonged care and domestication in their new environment. This level of maintenance suggests that the birds were not merely valued for their plumage but were kept a...