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 ...

When the snake vibrates its tail, these hollow segments hit against one another and create that iconic “rattling” sound.

In other species, for example, the Mojave rattlesnake, Crotalus scutulatus, the venom also has a strong neurotoxic effect ... make that buzzing sound as adults do. Rattlesnakes normally live ...