Candiru

Vandellia cirrhosa, known by the common names candiru, cañero, toothpick fish, or vampire fish, is a species of parasitic freshwater catfish in the family Trichomycteridae native to the Amazon basin where it is found in the countries of Bolivia, Brazil, Colombia, Ecuador, and Peru. The name "candiru" is also used to refer to other catfish species, including the entire genus Vandellia.