Leech

Generally called 'Leech', these Leeches (often misspelled leach or leaches) are flattened segmented worms with a sucker on both tail and mouth. They move by attaching the mouth sucker, then tail sucker, then mouth sucker, and so on, flipping along the surface similar to an inchworm. Blood sucking leeches have well Some of the leeches that feed on humans secrete a substance that has been found to be an anticoagulant.