Evidences
Yeti reports usually come in the form of tracks found, pelts offered, shapes seen at a distance, but rarely, actual face-to-face encounters with the creatures. Face to face encounters never come with researchers looking for the Yeti, but with locals who stumble into the creature during their daily lives.
Many Western writers are suspicious of the Sherpa accounts of Yeti sightings "because of their vagueness as to time and place, the obvious garnish of common folklore themes, and motivation derived from the animalistic philosophy of Tibetan Buddism." Furthermore, many of the sightings occurred in blizzard conditions or from far distances, suggesting that the people that spotted them may have been mistaken.
Thus, it is difficult without any scientific rigor and strong evidences or testimonies by several accredited witnesses to validate any of the so-called “proofs” that have been submitted so far. All the films, pictures, moulds, artefacts and even bones could be only the result of misinterpretation or forgery.
Concerning the tracks, it is difficult for scientists to have any certitude from photographs or casts. Even onsite, the tracks in snow, melted by the sun, can change shape and grow larger in such a way it has been suggested that the footprints and sightings of yeti were that of snow leopards, foxes, bears, monkeys. This theory doesn’t hold when the tracks are clearly that of a biped as both all these animals normally move on all four feet (but who is sure that they have not been printed by hand ?).
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