<P> A second possible introduction site in Kazakhstan is the Ili River delta at the southern edge of Lake Balkhash . The delta is situated between the Saryesik - Atyrau Desert and the Taukum Desert and forms a large wetland of about 8000 square kilometres . Until 1948, the delta was a refuge of the extinct Caspian tiger . Reintroduction of the Siberian tiger to the delta has been proposed . Large populations of wild boar, which were a main prey base of the Turanian tiger, can be still found in the swamps of the delta . The reintroduction of the Bukhara deer, which was once an important prey item is under consideration . The Ili delta is therefore considered as a suitable site for introduction . </P> <P> In 2010, Russia exchanged two captive Amur tigers for Persian leopards with the Iranian government, as conservation groups of both countries agreed on reintroducing these animals into the wild within the next five years . This issue is controversial since only 30% of such releases have been successful . In addition, as mentioned by Bahram Kiabi, a Professor of Ecology at Shahid Beheshti University, the Siberian tiger is not genetically identical to the Caspian tiger of Persia, but similar . Another difference between the Siberian and Persian tigers is climatic, with the latter's country having higher temperatures than that of its Siberian relative, and environmental expert Kambiz Bahram Soltani warned that introducing exotic species into a new habitat could inflict irreversible and unknown damage . In December 2010, one of the tigers exchanged died in Eram Zoo in Tehran . Nevertheless, the project has its defenders, and Iran has had successful reintroductions of the Persian wild ass and East Azerbaijan red deer . </P> <P> Future re-introduction is planned as part of the rewilding project at Pleistocene Park in the Kolyma River basin in northern Yakutia, Russia, provided the herbivore population has reached a size warranting the introduction of large predators . </P> <P> The large, distinctive and powerful cats are popular zoo exhibits . The Siberian tiger is bred under the auspices of the Species Survival Plan (SSP), in a project based on 83 tigers captured in the wild . According to most experts, this population is large enough to stay stable and genetically healthy . Today, approximately 160 Siberian tigers participate in the SSP, which makes it the most extensively bred tiger subspecies within the program . Developed in 1982, the Species Survival Plan for the Siberian tiger is the longest running program for a tiger subspecies . It has been very fortunate and productive, and the breeding program for the Siberian tiger has actually been used as a good example when new programs have been designed to save other animal species from extinction . </P>

What does a tiger have that no other animal has