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Apparently chickens can act as an intermediate host (eggs to cyst stages) for worms for whom humans and canines are a definitive host (cyst to adult stages). The classic example of this would be tapeworm.
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Actually, chickens do eat their own poo and I would be very surprised if yours don't. Chickens are a bit crap at digesting food, so they will quite happily pick out any undigested bits that they can find. They also seem to enjoy the more liquid types of poo which get swept up in a matter...