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Firstly, leeches need muddy water to live in or damp areas. Generally they suck blood so humans are important. They feed on flesh or fluids of other animals. Their prey includes insects, earthworms and their relatives, beach hoppers, snails, and freshwater clams. Blood-feeding leeches attack fish, turtles, crocodiles and their relatives, frogs, ducks, geese, other water birds and mammals. EG. HUMANS. hehe..
Predation and parasitism (relationships betweens species where the predator or parasite benefits and they prey is harmed) are some biotic factors.
http://animals.jrank.org/pages/1693/Leeches-Hirudinea-DIET.html#ixzz0JOk2oLS1&D
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