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Atlanta Zoo officials said on Friday that twin giant panda cubs, the first to be born and survive in the United States, have both turned out to be female. The zoo, which initially had identified both cubs as male after they were born in July, said DNA testing had now shown they are both female. "Prior to the time they are at least 3 years old, there are no obvious external cues as to their sex," the zoo said in a statement. Members of the public this fall helped choose the twins' names, Mei Lun and Mei Huan, which come from a Chinese idiom meaning "something indescribably beautiful and magnificent." | 
