Unconscious selection and habituation in captivity has resulted in loosing their fright for humans. The animals habituated to humans certainly will be more susceptible to illegal hunting and troubles with local people when released. In the groups where the horses had to rely on themselves completely for food, they learned to keep more distance from man in the semi-reserves. The young animals born in the semi-reserves did better, although individual differences could be seen. Przewalski horses, which were too tame could not be released.