Tiny Panda Cub Twin Dies

A heartbreaking update to the story of Mei Xiang's panda cubs: The smaller twin born to the National Zoo panda has died. The new mom had started ignoring the smaller cub in favor of nursing the bigger one, and the zoo tweeted today, "We are sad to report that the smaller of the two panda cubs has died. We will continue to provide updates on social media w/ #Pandastory." The good news: The zoo says the larger cub seems "strong, robust, behaving normally," USA Today reports. "We have one healthy panda and we remain optimistic about that panda's future," said the zoo's chief veterinarian at a press conference. Click to read about how the zoo had been attempting to swap out the cubs with their mom. (More panda stories.)