The waterwheel is a submerged aquatic plant closely related to sundews and Venus fly traps. Its leaves are in whorls and the leaf tips are fitted with scoop-like traps. It is a carnivorous plant that catches animal prey through an active trap mechanism - traps snap shut when triggered by prey. Traps number up to 200 per plant and researchers estimate that up to 80% of the traps may contain prey at any given time. These traps catch untold numbers of insects and other animals, giving scientists great concern about waterwheel's effect on food webs and rare invertebrate species. It is native to Africa, Asia, Australia, Europe, Japan, Korea. It is listed as "Endangered' on the IUCN Red List of Threatened Species. In its native range, waterwheel has declined to only 50 confirmed extant locations today.