A rattlesnake emits its famous warning signal without anything at all rattling around inside its tail. Here's how it works.

9:00am PDT - November 1st, 2019    juul - Business Insider

If you opened up a rattlesnake's rattle, nothing will spill out. That's because it doesn't work like a maraca to make that distinctive sound—instead, the outer shell of the rattle, which is made of keratin, clicks together. The snake uses special shaker muscl…