Although it is only a tiny, translucent [[eel]]-like creature no more than six inches long at most, the candiru is widely feared, perhaps even more so than the [[piranha]], for its habit of entering the human [[urethra]], which it is popularly believed to locate by following a scent trail. Erectile spines on its head, used to attach to the fish it feeds upon, make it almost impossible to extract without surgery; given the paucity of medical facilities in the [[Amazon River|Amazon]] region, most persons so afflicted die in horrific agony. | Although it is only a tiny, translucent [[eel]]-like creature no more than six inches long at most, the candiru is widely feared, perhaps even more so than the [[piranha]], for its habit of entering the human [[urethra]], which it is popularly believed to locate by following a scent trail. Erectile spines on its head, used to attach to the fish it feeds upon, make it almost impossible to extract without surgery; given the paucity of medical facilities in the [[Amazon River|Amazon]] region, most persons so afflicted die in horrific agony. |