Out of the 50 species of leeches found in Michigan, how many attach themselves to humans?

There are four species of leeches in Michigan that have been documented to attach themselves to humans. Leeches are often known for their bloodsucking capabilities, and while many species exist, only a few actively seek out humans for attachment. Understanding the biology and behavior of these leech species is crucial for both understanding their ecological role and for human interaction, particularly in recreational water activities. Identifying the correct number of species helps in managing contact and minimizing any potential health concerns associated with leech bites.