They found a report mentioning the Rinjani Scops owl's tone, which differs from the barking cry of the Moluccan Scops owl.
NPR: Brown-And-White Whistling Owl ID'd As New Species
2.
They noticed that its whistled note was entirely different from other songs, including that of the widespread Moluccan Scops owl, or Otus magicus.
NPR: Brown-And-White Whistling Owl ID'd As New Species
3.
They even suggest Christian militants want to revive the campaign for an independent South Moluccan state, although most Christians dismiss such an idea.