The tortoise (freshwater turtle, "guiban") and turtle (Chinese softshell turtle, "biejia") species used in traditional Chinese medicine are raised on farms, while restrictions are made on the accumulation and export of other endangered species. However, issues concerning the overexploitation of Asian turtles in China have not been completely solved. Australian scientists have developed methods to identify medicines containing DNA traces of endangered species. Finally, although not an endangered species, sharp rises in exports of donkeys and donkey hide from Africa to China to make the traditional remedy "ejiao" have prompted export restrictions by some African countries.