When someone urinates in the water, the candiru fish swims into and lodges itself in the urethra of the unsuspecting individual. Once inside, the fish uses the spines on its gill covers to hold itself in place, which is painful and makes removal possible

When someone urinates in the water, the candiru fish swims into and lodges itself in the urethra of the unsuspecting individual. Once inside, the fish uses the spines on its gill covers to hold itself in place, which is painful and makes removal possible