Leeches are still sometimes used in the medical field. They are used after plastic surgery and to help reattach ears, fingers, etc. They are also used to help heal bruises. How It Breathes Fresh water leeches have no breathing systems such as lungs or gills. Instead, they breathe through their skin.
Some species feed on blood, others eat detritrus, decaying plant and animal debris.
It eats by attaching its suckers to its food source. It can be an herbivore or predator. They move quickly by attaching suckers from one end to another.