It includes two interesting images, one of the wild male feeding and one of Carlos Yamashita examining the nest

An article about the Spix's Macaw project published in the April/May 1997 issue of "Parrots", which I previously overlooked. It includes two interesting images, one of the wild male feeding and one of Carlos Yamashita examining the nest of the Spix's Macaw/Illiger's Macaw pair with an endoscope donated by two British hospitals.