Washington's National Zoo Reveals Preliminary Findings In Death Of Baby Panda

WASHINGTON, DC - SEPTEMBER 24: The giant panda house at the Smithsonian National Zoological Park remains closed the day after the death of a six-day-old panda cub at the zoo September 24, 2012 in Washington, DC. The preliminary necropsy of the 4-ounce female cub did not immediately reveal the cause of death but zoo Chief Veterinarian Dr. Suzan Murray said the initial exam made it appear the cub was not crushed by her mother. (Photo by Chip Somodevilla/Getty Images)