If you look inside a rattlesnake rattle, you’ll find it’s actually hollow. Instead of shaking loose bits like a maraca to make that famous sound, rattlesnakes clack together segments of keratin — the same material found in your fingernails. They use three shaker muscles to vibrate the tips of their tails up to 90 times a second, which is many times faster than you can blink!

MORE WHAT'S INSIDE:
What's Inside A Camel Hump?
https://www.youtube.com/watch?v=oyM_AXN_QNI
What's Inside A Venus Flytrap?
https://www.youtube.com/watch?v=YPzp-p-na88
What’s Inside A Kangaroo’s Pouch?
https://www.youtube.com/watch?v=CmTovo7kyIM

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What's Inside A Rattlesnake's Tail?