This is a cast of a supposed rock ape footprint taken in Kon Tum Province, Vietnam. The rock apes are a proposed bigfoot-like creature that roam the jungles of Vietnam. This particular cast was taken in April of 1982 by Professor Tran Hong Viet. It measured out to being 11 inches long and 4.5 inches wide.
Legends of rock apes go back for hundreds of years. In the 1970s, the interest in the creature grew, including a Vietnamese government sponsored expedition to find them in 1974. In the later years of the Vietnam War, both American and Vietnamese soldiers claimed to see mysterious humanoid creatures in the trees. But seeing them wasn't enough, the soldiers were often confronted by these creatures. The rock apes reportedly tossed boulders at the soldiers, no matter what side they were fighting for.
US Army Sergeant Kregg Jorgenson wrote about one particular encounter in his book, Strange But True Stories of the Vietnam War:
“It was a hot day. The six men from the 101st Airborne Division were taking a break in the middle of a mountainous jungle when the event took place. Suddenly, according to the men, a few small trees located fifteen yards uphill began clearly shaking. The soldiers had trained for this, and as they got ready for combat to fight the expected VC soldiers jumping out the bushes, they never imagined what they saw next.”
A long, cucumber-shaped head showed up. The face, the soldiers said, was covered in red hair with a pair of dark eyes and a huge mouth. The creature then stepped out of the vegetation into a clearing, allowing the group to observe the rest of its muscular body, which was also featured by the same type of red hair. It wasn’t taller than five feet and walked upright. It stopped, looked at them as though scrutinizing each of the soldiers.”