they are extinct in their natural habitat look and read the link above you 'll know everything about them and why know you can see and hunt some if them in texas ! The last Père David's Deer that remained in China were eaten in 1900 or 1901 by Western and Japanese troops during the suppression of the Boxer Rebellion. That left the deer extinct in its native China.
fortunatly, today , cos of zoo or park population far from china you have now some re introduction programs in the native area of this deer