Former Houston Rockets basketball player Yao Ming joins a group of schoolchildren to feed the giraffes at the Houston Zoo on Thursday, Feb. 14, 2013, in Houston. Yao has been working to bring awareness to the need to protect endangered species, a cause he's undertaken since retiring from basketball in 2011.(AP Photo/Pat Sullivan)

Associated Press
Former Houston Rockets basketball player Yao Ming joins a group of schoolchildren to feed the giraffes at the Houston Zoo on Thursday, Feb. 14, 2013, in Houston. Yao has been working to bring awareness to the need to protect endangered species, a cause he's undertaken since retiring from basketball in 2011.(AP Photo/Pat Sullivan)
Former Houston Rockets basketball player Yao Ming joins a group of schoolchildren to feed the giraffes at the Houston Zoo on Thursday, Feb. 14, 2013, in Houston. Yao has been working to bring awareness to the need to protect endangered species, a cause he's undertaken since retiring from basketball in 2011.(AP Photo/Pat Sullivan)
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