A century after falling out of favor among doctors, medicinal leeches are back in hospitals, sucking away on patients’ wounds.

Watch the segment, or see full July 23, 2008 episode.

Hunt for the Giant Leech
You suddenly find yourself waist-deep in the swampy home of the giant Amazonian leech. What now?

Ask the Expert
Mark Siddall, lord of leeches at the American Museum of Natural History, answers your questions about these stretchy, bloodsucking creatures.

Video Extra
Find out why leeches are always the bad guys in the movies.

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