On November 8, 1951, noted mountaineer and adventurer Eric Shipton and Dr. Michael Ward were on an expedition to find an alternate route to ascend Mount Everest. At approximately 17,500 feet and exploring a glacier near an Everest basecamp they came across a set of massive footprints that shouldn't have been there. The only possible known creatures that they thought could have left such crisp footprints in the snow at that altitude were humans, bears or yaks, and they didn't look exactly like any of those to them, but more like a strange unknown barefooted hominoid. Their Sherpa guides, however, knew exactly what had left those footprints, the legendary Yeti, known to the indigenous peoples of the region for at least hundreds of years, and was both feared and revered. Shipton set the head of his ice ax next to the track, which measured about a foot long and 5" wide, and took a picture.