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If dispassionate investigations continue, evidence may eventually turn up of even more interesting human activity and settlement.
1. Early Portuguese explorers reported the presence of a race of Caucasians in what is now called Patagonia.(The name derives from the Portugese word of the time for "Big Footed").The Bigfoot people were quite tall (7', typically ) and had relatively large feet. Some were taken captive and shipped back to Portugal, but did not survive the voyage.
2. A secondary race, found in the high mountain caves ( as reported by indigenous natives ) was the Little People or Great Little People. Supposedly, they were somewhat similar to Pygmies, and had a hunter/gatherer culture. The Sioux and the Iroquois were rather matter-of-fact about them, and noted they were a "poison arrow people".( I've seen some evidence-in the form of footprints- suggesting they may still survive.)