According to Alfred Métraux, the presence of flocks of parrots in the vicinity of the Indian tribes allowed them to be plucked and provided the raw material for crowns, caps, collars, and leggings. The Tupi Indians of Brazil were not content to pluck the feathers of captured birds. They attempted to change the color of the living birds’ natural plumage. The Tupi Indians coated the feathers with frog’s blood to make green feathers grow yellow.
An historical tradition or not, we would call this practice animal cruelty. Unfortunately this tradition of plucking parrot feathers among South American Indians is not confined to the dark reaches of the historical past, but continues to this day, and is the object of continuing study by researchers.