Article Photos: No clear explanation for giant panda cub's death



Mei Xiang, a giant female panda, rests at the National Zoo in Washington, Thursday, Oct. 11, 2012. The zoo announced Thursday that the recent death of Mei Xiang's cub was due to liver and lung damage. (AP Photo/Jacquelyn Martin)

Mei Xiang, a giant female panda, rests at the National Zoo in Washington, Thursday, Oct. 11, 2012. The zoo announced Thursday that the recent death of Mei Xiang's cub was due to liver and lung damage. (AP Photo/Jacquelyn Martin)