Colo Colo (mythology)
The Colo Colo or Colocolo is an evil rat-like creature from Mapuche mythology.
The colocolo is reputed to nest near a residence and sneak in, drinking blood from a sleeping resident, or sucking or extracting saliva, or licking utensil, causing debilitating weakness or tuberculosis. It must be exterminated in timely manner to save the life of the human.
It is often said to hatch from a stunted-looking "rooster's egg", and the young resembles a snake or burrowing lizard, but it later metamorphosing into a feathered rat form.
A type of wildcat is also called "colocolo", and this may perhaps be related to the origin of the lore.