Appearance: Flukes are typically flat, leaf-shaped worms that can vary in size depending on the species. Adult flukes can range from a few millimeters to several centimeters in length. They have suckers that they use to attach to the host's tissues, feeding on blood, mucus, or tissue fluids.
Lifecycle: The lifecycle of flukes is complex, involving multiple hosts and stages. It usually begins when fluke eggs are excreted in the feces of an infected host. These eggs hatch in water, releasing larvae called miracidia, which then infect snails. Inside the snail, the larvae develop and are released as cercariae, which can penetrate the skin of a new host or be ingested through contaminated food. Once inside the final host, the larvae migrate to specific organs, such as the liver or lungs, where they mature into adult flukes.