Ancient leg-hold trap or foot trap (khogtse), National Museum, Ulaanbaatar, Mongolia. These traps were buried and anchored (or frozen) into the ground at the end of drive lines made out of rock cairns or lines of rock. The drive lines funneled the animals to the place where traps were buried. The traps are designed to trap ungulates such as gazelles or Tibetan antelope and appear to have been used on the Tibetan plateau and also in Mongolia. Once trapped the hunters could approach and kill the animals.