Keepers had an opportunity to weigh the 4.5 week-old giant panda cub on Sept. 21. Smithsonian's National Zoo hide caption
pandas
Giant panda Jia Jia eats bamboo next to her birthday cake made with ice and vegetables at Ocean Park in Hong Kong, on Tuesday. Kin Cheung/AP hide caption
Bao Bao enjoyed her first snow day at the National Zoo, sliding down a hill and playing with her mother. Devin Murphy/Smithsonian's National Zoo hide caption
You can help select a name for the National Zoo's new panda cub. Abby Wood/Smithsonian's National Zoo hide caption
The panda cub now weighs 5 pounds. This photo was taken Tuesday. Courtney Janney/Smithsonian's National Zoo hide caption
The Smithsonian National Zoo's newest giant panda on Aug. 25, two days after her birth. National Zoo/UPI/Landov hide caption
In this image from video provided by the Smithsonian National Zoo, Mei Xiang gives birth to a cub two hours after her water broke Friday. A second cub born Saturday was stillborn. AP hide caption
Lun Lun's twins were born at Zoo Atlanta on Monday night. Adam K. Thompson/Zoo Atlanta hide caption
The giant panda Lin Ping, a star in Thailand whose mandatory trip to China was due at the end of May, can spend up to 15 years in Thailand, under a deal announced this week. The 43-day-old Lin Ping was held by her mother, Lin Hui, in this 2009 photo. Wichai Taprieu/AP hide caption
Sean Connery during the making of the James Bond film "Never Say Never Again." AFP/Getty Images hide caption
Panda cub Xiao Liwu was eager to play with a plastic ball during an exam last month. He made his public debut at the San Diego Zoo on Thursday. Ken Bohn/San Diego Zoo/AP hide caption
Mei Xiang at the National Zoo earlier today. Her cub died last month. Rod Lamkey Jr. /The Washington Times /Landov hide caption
Dennis Kelly (right), director of the Smithsonian's National Zoo, and Suzan Murray, chief veterinarian, discuss the panda cub's death. Mark Wilson/Getty Images hide caption