Narrator: If you're hiking pretty much anywhere in the US, this is one sound you don't want to hear... [Audio of rattlesnake rattle.] The warning of a rattlesnake. Now, just because a rattlesnake ...

Rattlesnakes are venomous pit vipers native to the Americas, with 33 species identified by their distinct tail rattle. They ...

Baby rattlesnakes usually have a small rattle or button when they are born. According to National Geographic, if you can hear the snakes warning sound “ch-ch-ch” — you’re too close.