—”Sky’s signal stopped suddenly on 10 September and Hope’s signal died three days later. Searches of the area have failed to find any trace of them.The tracking devices are designed to operate for at least three years. The scientists say it’s “improbable” that this is due to technical failure. The more likely cause is that the birds were killed by other animal predators, or humans.”

read article: Threatened birds of prey ‘vanish’