When in the desert better check first before you grab...

Lucky! That could have been a hard way to learn that lesson. I have had a full sized sidewinder in camp (about 3.5'). They make a really high pitched buzz, closer to a cicada type noise. The typical western / red rattler is a lower pitch. As for the roadrunner, well, that's the cycle of life. And yes, they are fast when lunch is trying to get away.