Three double knocks, two birds?

On this recording you can hear three sets of double knocks, the first occurring at a distance, followed by a closer double knock and a very faint double knock. These sounds could be interpreted as double knocks made by one woodpecker answering another. These sounds may represent the first tangible evidence of more than one ivory-bill in the area.

Note that in the double knock, the second knock is louder than the first, unlike descriptions of Ivory-billed Woodpecker display drums from Louisiana in the 1930s, in which the first knock is louder. It is possible that Ivory-billed Woodpecker display drums vary depending on the region and the context in which they are used, but no one knows this because so few ivory-bills have ever been studied.

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