Leech
Leech, common name for carnivorous or bloodsucking worm once widely used by physicians and barbers for bloodletting and still used for this purpose in some regions of the world. In modern medicine, bloodletting is no longer practiced, but leeches continue to be used to relieve blood congestion in certain delicate operations, where such use is less likely to cause infection than other techniques. Leeches are widespread in marine waters and are found in fresh water and on land in temperate and tropical regions.
The animals are flattened ringed worms, measuring from 5 mm to 46 cm (0.2 to 18 in) in length and are equipped with a sucking disk at both the anterior and posterior end
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