Why does bamboo make a chattering sound?

Bamboo is a type of grass that grows into big clusters of long, straight stalks. Those stalks are super strong, and are useful for making lots of things, from instruments to gardening tools, to building materials. And when a breeze blows through a bunch of bamboo, it makes a really cool chattering, rattling sound. How does it do that? And why? We asked biologist Lynn Clark to help us find the answer.

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