Nguruvilu

The Nguruvilu (from Mapudungun ngürü, "fox" and filu, "snake";[2][3] also styled: Ngurru vilu, Guirivilo, Guruvilu, Ñuruvilu, Ñirivilu, Ñivivilu, Ñirivilo and Nirivilo) is a creature originating from the Mapuche religion of the indigenous people inhabiting Chile.

The only way to get rid of a nguruvilu is through the offices of a machi (shaman) or good kalku "sorcerer".

Afterwards, they swim to the surface having captured the Nguruvilu in their arms with their powerful magical abilities.

They then proceeds to threaten the creature with a long, sharp knife, saying they will mutilate it if it ever harms another person trying to cross the waterway.

It is believed the creature moves its business elsewhere, probably to torment the peoples downstream at the next popular river crossing.