Dude carefully slices rattlesnake tail -- and here's what he found inside

You would have probably heard the sound a rattlesnake makes when it shakes its tail.

Have you wondered however what causes that sound that it uses as a warning signal?

In an attempt to find that out, a YouTuber got his hands on a rattlesnake's rattle and cut it open using a knife.

Find out what he discovered in it in the video below.