There you go with your darned science! lol I was thinking the same thing but I didn't want to ruin everyone's fun.
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I suppose if the spiders were aquatic they could get big like that, just like sharks. I guess thats what giant squid are, just big squishy spiders.
Someone may have already said this, buy you are right... Brown Recluse Spiders are very rare in CO. What we have in Colorado is the Hobo Spider and they look very similar. I think their bite is similar too... causes the same sort of breakdown of skin tissue...
I don't think it's either a Recluse or a Hobo...