I don't believe pigeon shit is considered guano. According to dictionary.com guano comes from bats and sea birds:
http://dictionary.reference.com/browse/guano
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...You've been under attack for days, there's a soldier down, he's wounded, gangrene's setting in, 'Who's used all the penicillin?' 'Oh, Mark Paxson sir, he's got knob rot off of some tart.'" - Gareth Keenan
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