Premise: The Chullachaki (Quechua, "one-footed", from "chulla" or "ch'ulla" = single, odd, unpaired, asymmetric, "chaki" = foot; spelling sometimes also used in Spanish) or Chullachaqui (hispanicized spelling), also known as the Shapishico, is a mythical forest creature of the Peruvian and Brazilian Amazonian jungle.
Hypothesis: The Chullachaki has been around since the 50s