Photographs of members of representative taxa, and the equipment used in studying them.

Basic introduction to the orders and families, habitat, and value as an indicator of overall ecosystem health.

The history of medicinal use of leeches.

A study of the behavior, biology, adaptation to habitat, feeding habits and importance to medicine, reveals leeches to be fascinating and extraordinary animals.

An introduction to the biology, classification and ecology of leeches, the subclass Hirudinae

Article about the medicinal leech from Animal Diversity Web.

Photographs of various species from the North Pacific and the Ukraine.