Leeches have been used for bloodletting for centuries. In fact, they became so popular in the 18th and 19th centuries that they were almost farmed to extinction in Europe. Although falling out of fashion in the later half of the 20th century, their medical use is making a comeback in microsurgery and reconstructive surgery due to the anti-coagulant properties of their secretions, which is useful for reducing blood clots and venous pressure from pooling blood, and for healing skin grafts. […]

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