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Photos: New Panda Twins Keep D.C. Zookeepers Busy

The Smithsonian's National Zoo is home to two new twin pandas. The mother, Mei Xiang (may-SHONG), gave birth to the cubs at 5:35 p.m. and 10:07 p.m. EDT on Saturday (Aug. 22). Mei Xiang can take care of only one cub at a time, so while one cub is with Mom, the other rests in an incubator at the zoo. After about 3 to 4 hours, the zookeepers switch the cubs, giving the newborns equal time with Mei Xiang. [Read the full story on the twin panda cubs]

Tape measure

Zoo staff measure the second-retrieved cub. When the cub isn't spending time with its mother, it rests in an incubator at the zoo and feeds on a special formula made out of water, human baby formula and puppy formula. (Image credit: Devin Murphy, Smithsonian's National Zoo)

First exam

The second-retrieved cub squirms as a team examines the animal's weight, length, mouth size, heart rate and breathing rate. (Image credit: Pamela Baker-Masson, Smithsonian's National Zoo)

A star is born

The second-retrieved cub already has tiny claws, but still has a lot of developing to do. (Image credit: Pamela Baker-Masson, Smithsonian's National Zoo)

Squealing cub

Giant pandas give birth to twins about 50 percent of the time. However, the mother can only pick up and care for one twin at a time, so zoo staff are helping both cubs survive by rotating them from their mother's den to the incubator every 3 to 4 hours. (Image credit: Pamela Baker-Masson, Smithsonian's National Zoo)

Open wide

Veterinarians examine the first retrieved-cub's mouth with a light. (Image credit: Pamela Baker-Masson, Smithsonian's National Zoo)

Swaddled panda

Veterinarians swaddle and examine the first-retrieved cub. Its sex won't be determined until a later date. (Becky Malinsky/Smithsonian's National Zoo)

Heartbeat

The veterinarians check the heartbeat of the first-retrieved cub. (Photo credit: Pamela Baker-Masson, Smithsonian's National Zoo)

The birth

Giant panda Mei Xiang delivered two cubs on Aug. 22. Her water broke at 4:32 p.m., and she gave birth at 5:35 p.m. EDT. After giving birth to the first cub, Mei Xiang picked it up. (Image Credit: Panda-Cam-11 (8_22_2015 5_36_04 PM) )

Panda ultrasound

Veterinarians used panda sperm to artificially inseminate Mei Xiang in April. An ultrasound in late August showed what veterinarians believed to be a fetus. However, it was still unclear whether Mei Xiang was having a real or a pseudo pregnancy, in which her body would act like it was pregnant even though it wasn't. (Image credit: Smithsonian's National Zoo.)

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Laura Geggel

Laura is an editor at Live Science. She edits Life's Little Mysteries and reports on general science, including archaeology and animals. Her work has appeared in The New York Times, Scholastic, Popular Science and Spectrum, a site on autism research. She has won multiple awards from the Society of Professional Journalists and the Washington Newspaper Publishers Association for her reporting at a weekly newspaper near Seattle. Laura holds a bachelor's degree in English literature and psychology from Washington University in St. Louis and an advanced certificate in science writing from NYU.