Colo Colo (mythology)
The Colo Colo or Colocolo is an evil rat-like creature from Mapuche mythology.
The Colo Colo is reputed to nest near a residence and sneak in, drinking blood from a sleeping resident, extracting saliva or licking utensils, causing debilitating weakness or tuberculosis.
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 metamorphoses 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.