Not for the faint of heart, but I've seen several of these spiders recently in my driveway and wondered if any of you know what they are and if they're poisonous or anything. It's about the size of a silver dollar with its legs out and they scoot along really fast when startled. This particular spider is full of egg sacks. How do I know? Well, when foot hit spider hundreds of smaller spiders came running out in all directions. Sorry PETA. I'm pretty tolerant of gross things, but this even gave me the willies. I call her Margo.