スミソニアン国立動物園のインスタグラム(smithsonianzoo) - 2月27日 23時26分

? Zoo visitors may *hear* our siamangs, Bradley and Ronnie, before they see them. That’s because siamangs mark their territory with daily singing rituals!
To vocalize, these apes inflate their throat sacs and produce two kinds of notes: a deep boom and a loud "wow.” These calls start off slowly, but increase in speed. They are often accompanied by some behavioral acrobatics! Visit our siamangs at Gibbon Ridge: https://nationalzoo.si.edu/visit/daily-events.

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