What's Inside a Rattlesnake Rattle?

A rattlesnake rattle is a fascinating natural structure made up of a series of hollow, interlocking segments composed of keratin—the same protein found in human hair and nails. Contrary to popular belief, it doesn't contain any beads or small stones. The distinctive sound of the rattle is produced when these segments knock against each other as the snake vibrates its tail rapidly. As the snake grows, it sheds its skin and adds a new segment to the rattle. The rattle is an essential defense mechanism, warning predators and humans alike to stay away.

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