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At Antonio's funeral at the São Francisco Xavier Cemetery four days after his killing, one of his friends delivered his mother’s eulogy: "You were so full of life and hope. Now you are a victim of a bullet."

The parrot — endemic to a small fraction of the Sao Francisco River basin and already rare in the 19th century — was declared extinct in the wild in 2000, when a lonely surviving male disappeared following decades of poaching and habitat destruction from livestock overgrazing.

The study by Staffordshire University and Federal University of Vale do Sao Francisco has found that 'exergames' can change people's perceptions of how fatigued they are -- which is potentially harmful for those with the condition.

"By looking at the deltas together, like we have in this study, we want to highlight what can happen on a global scale if we do not address delta risk both on a local and global level. The study can also complement studies on individual deltas, and identify efforts needed connected to less studied deltas such as the Saõ Francisco or Volta delta," says Maria Santos, professor at the University of Zurich.

Some places, such as Brazil’s Rio São Francisco basin, face a challenging future; others, including the Great Lakes region of the United States, are in better shape.