[leadpenny]

I've experienced them twice - Fort Knox in 74 and in Northern Virginia about 15 years ago. Road marching with the troops on the range roads at Knox, you couldn't hear yourself think.

They are fascinating and a good way to get kids interested in the wonders of nature.

[Cincinatus' Wife]

I experienced the 17 year ones in Arizona, loud and messy but not like what they're describing here. I also have lived with the TX variety, a background annoyance you tune out.