Scops owl (Otus thilohoffmani), Sri Lanka

角枭（Otus thilohoffmani），斯里兰卡

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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

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

But scientists from Sweden and the U.S., who were visiting the island doing separate research on another nocturnal bird, both recorded the Rinjani Scops owl's vocalizations.

NPR: Brown-And-White Whistling Owl ID'd As New Species