Definition
A leech is a segmented worm belonging to the class Hirudinea, known for its blood-sucking habits. These creatures typically have flattened bodies and suckers at both ends, aiding in attachment and locomotion. They inhabit various environments, including freshwater, terrestrial, and marine habitats. While many are parasitic, feeding on the blood of vertebrates, some are predators of small invertebrates. Leeches have been used historically in medicine for bloodletting. 🩸 Think of them as nature's tiny vampires, though not all suck blood. They secrete anticoagulants to keep the blood flowing during feeding.