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Morphological, histochemical, and ultrastructural characterization of the salivary glands and proboscises of three species of glossiphoniid leeches (Hirudinea: Rhynchobdellida).
A study of the behaviour, biology, adaptation to habitat, feeding habits and importance to medicine, reveals leeches to be fascinating and extraordinary animals.
This page states that leeches are among the most highly specialized of the annelids. They are predominantly freshwater organisms, although there are marine and terrestrial forms. Leeches are highly specialized predators that feed on blood.