Mei Xiang is exhibiting signs of pregnancy, but it could be a pseudopregnancy.

Is Mei Xiang pregnant or just bored?

Mei Xiang. Photo by Daniel.Techie @ 127.Ø.Ø.1 Oh, Mei Xiang, you absolute heartbreaker. Staff at Smithsonian’s National Zoo confirmed late yesterday their adult female giant panda is in fact not pregnant, and was instead experiencing another one of her pseudopregnancies. This also happened last summer. And the summer before that. The Zoo’s Panda House has been closed for several weeks while National Zoo scientists monitored Mei Xiang’s hormone levels and behavior and conducted ultrasound…