Two oldest pandas outside China risk ending Mexico family tree Pandas Shuan Shuan and Xin Xin, descendants of gifts offered from China to Mexico before the restrictions on their export were put into place, are the oldest giant pandas living outside of China and the only examples of the species in South America. Whilst the key to their longevity may be in their carefully studied diet, the two black and white bears have never reproduced. IMAGES AND SOUNDBITES