Giant panda gives birth to cub at National Zoo

The National Zoo's female giant panda has given birth to a cub following five consecutive pseudopregnancies in as many years, USA today reports.
Mei Xiang gave birth Sunday at 10:46 p.m., the zoo said. The staff can hear the cub, but has yet to see it because Mei Xiang has built a large nest in her den.
In a news release, Dennis Kelly, the zoo's director, said he was thrilled.
"I'm cautiously optimistic as we haven't seen the cub yet, but we know that Mei is a good mother," Kelly said.
The cub is the second born to Mei Xiang and Tian Tian as the result of artificial insemination. Veterinarians will perform the first physical exam after Mei Xiang and the cub have had time to bond, the zoo said. The new mother will most likely not come out of her den, or eat or drink, for at least a week.