A chicken walker is a fictional type of bipedal robot or mecha, distinguished by its rear-facing knee joint. This type of articulation resembles a bird's legs, hence the name. However, birds actually have forward facing knees; they are digitigrade, and what most call the "knee" is actually the ankle. Arguably, the first chicken walkers originated in Slavic fairy tales, as the "Hut on Chicken Legs" or "Избушка На Курьих Ножках", a literally walking house without any doors or windows. More often than not it is the place of residence of a witch (see Baba Yaga).