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

arrow Hunt for the Giant Leech

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

arrow Ask the Expert

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

arrow Video Extra

Leeches are always the bad guys in the movies.