Panda Cub Welcomed Into The Family At National ZooA giant panda at Washington's zoo surprised scientists and zookeepers by becoming a mom again after years of failed pregnancies.
National Zoo To Live-Tweet Panda Pregnancy WatchWell she's not pregnant yet, but she's National Zoo officials are hopeful Mei Xiang will give birth to a cub this year. And they'll be taking you behind the bars to witness the entire process...on Twitter.

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