Giant panda gives birth to twins at National Zoo (7 images)

A veterinarian examines one of the giant panda cubs born to mother Mei Xiang, at the Smithsonian's National Zoo in Washington, D.C. , August 22, 2015 at the Giant Panda Mei Xiang gave birth to a set of panda cubs on Saturday, August 22, at 10:07 p.m. Giant pandas give birth to twins approximately 50 percent of the time. This is only the third time a giant panda living in the United States has given birth to twins. Smithsonian National Zoo Photo/Pamela Baker-Masson/UPI

A veterinarian feeds one of the giant panda cubs born to mother Mei Xiang, at the Smithsonian's National Zoo in Washington, D.C. , August 24, 2015 at the Giant Panda Mei Xiang gave birth to a set of panda cubs on Saturday, August 22, at 10:07 p.m. Giant pandas give birth to twins approximately 50 percent of the time. This is only the third time a giant panda living in the United States has given birth to twins. Smithsonian National Zoo Photo/Pamela Baker-Masson/UPI

Veterinarians examine one of the giant panda cubs born to mother Mei Xiang, at the Smithsonian's National Zoo in Washington, D.C. , August 22, 2015 at the Giant Panda Mei Xiang gave birth to a set of panda cubs on Saturday, August 22, at 10:07 p.m. Giant pandas give birth to twins approximately 50 percent of the time. This is only the third time a giant panda living in the United States has given birth to twins. Smithsonian National Zoo Photo/Pamela Baker-Masson/UPI

A veterinarian examines one of the giant panda cubs born to mother Mei Xiang, at the Smithsonian's National Zoo in Washington, D.C. , August 23, 2015 at the Giant Panda Mei Xiang gave birth to a set of panda cubs on Saturday, August 22, at 10:07 p.m. Giant pandas give birth to twins approximately 50 percent of the time. This is only the third time a giant panda living in the United States has given birth to twins. Smithsonian National Zoo Photo/Pamela Baker-Masson/UPI