Leech
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Leeches are annelids or segmented worms, which are closely related to earthworms. Although they are closely related, their behavior and anatomy are more specialized. They feed by clinging onto a host body and sucking their blood. Leeches mainly reside in fresh water lakes or swamps and their presence is usually undesired. Some species are also capable of living on land or in the ocean. Leeches have been used extensively in medicine for over 2000 years.