What's inside a Rattlesnake Rattle?

Yo, snakes freak me the **** out!!  This video didn't help.  What's Inside goes to the zoo, before eventually cutting open a rattlesnake rattle for over 60,000,000 viewers.  Pretty interesting.  

We CUT OPEN a Rattlesnake Rattle to see what’s inside!!

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What's inside a Rattlesnake Rattle?