Six-legged robots, or hexapods, are motivated by a desire for even greater stability than bipedal or Quadrupedal robots.
However, the Yeti is generally described as bipedal,
and most scientists believe Gigantopithecus to have been Quadrupedal, and so massive that,
unless it evolved specifically as a bipedal ape(like Oreopithecus and the hominids), walking upright would have been even more difficult for the now extinct primate than it is for its extant Quadrupedal relative, the orangutan.
However, while the Yeti is usually described as a bipedal,
most scientists feel that Gigantopithicus was probably Quadrupedal, and so massive that unless it evolved specifically as a bipedal ape(like Oreopithecus
and the hominids) upright walking would have been even more difficult for the now extinct primate than it is for its extant Quadrupedal relative, the Orangutan.