New work on the skeletal remains of scarlet macaws found in an ancient Pueblo settlement indicates that social and political hierarchies may have emerged in the American Southwest earlier than previously thought. Researchers determined that the macaws, whose brilliant red and blue feathers are highly prized in Pueblo culture, were persistently traded hundreds of miles north from Mesoamerica starting in the early 10th century, at least 150 years before the origin of hierarchy is usually attributed. The findings, published in the Proceedings of the National Academy of Sciences, suggest that the acquisition and control of macaws, along with other valued...