Needless to say, once sheltered by a roof, carried in a car, and fed from a can, very few humans willingly return to sleeping on the ground, walking cross-country, and foraging with hand tools. The same is true of tigers: once they have been habituated to zoo conditions, there is no going back. To date, there has been no case of a captive tiger being successfully introduced, or reintroduced, to the wild. Captivity is a one-way trip.
