Macroinvertebrate Introduction A leech can grow to be 5-400 millimeters in length. It has a somewhat-flat body, with 34 segments, similar to that of a worm. Another name for a leech is bloodsucker.
Leeches belong to a group called Hirudinea.
Special Features Leeches are tolerant. Some leeches have patterns of bright colors like red and yellow. Habitat They live in fresh water. They try to avoid light. They like to be close to decomposing materials and sometimes venture onto land.