How does the crested pigeon make their mysterious alarm sound?

Описание к видео How does the crested pigeon make their mysterious alarm sound?

Scientist have solved the mystery of how crested pigeons create an alarm without using their voice to prompt other birds to flee danger.
Researchers have long suspected that some pigeons raise an alarm using their wings. But new research from The Australian National University has for the first time discovered the crested pigeon uses a modified feather to sound the alarm.

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