The legend of Kap Dwa, the two-headed monster, originally appeared several hundred years ago, in 1673. It tells the story of a minor Spanish settlement that was ruthlessly besieged by a monster, a 3 meter tall behemoth with two heads.
After outwitting the primitive giant, the villagers grabbed him and stabbed him to death out of concern that he might escape. As you can see, we thought this was just a bedtime story for youngsters.
We may have only recently discovered evidence that this story is historical rather than fanciful. The mummy was discovered in Paraguay, not Patagonia, and there are various mysteries surrounding its origins. Nowadays, everyone has their own interpretation of reality.
Whatever the case, this monster existed, it lived, and we now have its mummified body with knife cuts to its head and torso.