The length of the Kurupi's penis is unknown to Monstrologists because the reproduction organ can stretch to amazing lengths. Failed attempts to record the length of the organ always resulted in it being retracted back into the Kurupi's body. It's known to slither its way through openings (windows, doors, etc...) into houses to drain energy and cause unwanted pregnancies (which later results in an infant Kurupi because this is the only way for it to reproduce due to no females within the species). The Kurupi is an exclusive creature and accidental confrontations are due to a person accidentally stepping on the reproduction organ, being mistaken to be a fallen branch or a moving snake.
In Guaraní Mythology, the first Kurupi is the fifth son of Tau (an evil spirit of the Guaraní people) and Kerana (the daughter of Marangatu).