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WASHINGTON, May 3 (UPI) -- Behavioral changes exhibited by the Washington National Zoo's giant female panda have put zoologists on a pregnancy alert, officials said.

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WASHINGTON, Jan. 14 (UPI) -- The National Zoo in Washington issued a public appeal Wednesday for bamboo after the food supply for the zoo's giant pandas became dangerously low.

WASHINGTON, Aug. 13 (UPI) -- Mei Xiang, a giant panda at the Smithsonian's National Zoo in Washington, won't be giving birth to a cub this year as initially thought, zoo staff say.

WASHINGTON, June 24 (UPI) -- Scientists at the U.S. National Zoo say it might be mid- or late July before they can definitely determine if giant panda Mei Xian is pregnant.

WASHINGTON, June 20 (UPI) -- Officials at Washington's National Zoo say there are signs that one of its beloved pandas might be pregnant.

WASHINGTON, March 24 (UPI) -- U.S. veterinarians have artificially inseminated Mei Xiang, a female giant panda at the Smithsonian's National Zoo, after natural mating was unsuccessful.

WASHINGTON, July 7 (UPI) -- Giant panda Mei Xiiang is not pregnant after all, say veterinarians at the U.S. National Zoo in Washington.