I hate home some web sites are implying that this photo was "staged" or doctored. Like Tony said, if you use the soldier's sleeve as reference (most sleeves are maybe 4-5 inches tall?), you can see the spider can clearly fit inside of that. So the body of that spider is probably 3-4 inches from that photo. I doubt the soldier had a ruler lying around. He probably had no idea it would be getting around the net either.
Tony, if I were you, I'd move. That would just freak me out.
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Brad B.