Australian Museum
Australian Museum Online: Leeches
This site provides extensive information including body diagrams of different types of leeches.
University of California
Ucmp: Annelids Life and History
Description of the life history and ecology of Annelids.
Mocomi & Anibrain Digital Technologies
Mocomi: Earthworm Facts and Information
Learn where earthworms live, how they are useful to the environment, and other interesting fun facts.