See also, from http://www.gateworld.net/fanfic/archive/10/desertoperations.html:
"...I wondered across the compound, heading for my assigned living quarters, when movement caught my eye. I stopped walking; the movement ceased. I took a couple of steps; more movement out of the corner of my eye. A couple of fast steps, walking backwards, and I could see them; six large spiders following my every move. It's a very eerie feeling, being chased by four-inch spider like creatures. The camel spider is not really a spider but a solifugids - kind of a cross between a spider and a scorpion. I tried to remind myself that, like most creatures, they prefer to hide from me, rather than attack me. Hard to remember when you are being chased by one (or more) of them!!I watched them follow me as I continued walking backwards. They are very fast - capable of traveling up to 10 mph when hunting for prey - however, in this case, they were simply following my shadow. As I moved, so followed my shadow, giving the spider camel the appearance of chasing after me.
Finally arriving at my quarters I set my gear down on the cot, grateful that I didn't have to sleep on the ground tonight..."