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 are actually clacking together segments of keratin – the same material that’s found in your fingernails.

They do this by using 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!

View the original video here.

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