Leeches

Leeches are segmented hermaphroditic worms that are widely distributed and are able to ingest ten times their body weight (between 5 and 15 ml). When leeches attach with their suckers, ready to feed, they secrete an anaesthetic which acts locally as an anticoagulant, called hirudin, so that bloodflow is not hindered. It is the method of feeding which has proved useful to medicine. Leeches are again widely used in Russia for the therapy of a number of conditions in areas such as cardiovascular disease, opthalmology and dermatology. They are thought to act as anti-inflammatory, anti-thrombolytic and anti-hypertensive agents. They are even thought by some to be practitioners to be the saving grace for treating terminal glaucoma.