Double happiness as giant panda gives birth to twins in US

An ultrasound image of the National Zoo's giant panda Mei Xiang is pictured in this handout photograph taken and released on August 19, 2015. Mei Xiang is believed to be carrying a developing fetus and could give birth in coming weeks, the Washington zoo said on Wednesday, August 12, 2015. Veterinarians detected a 1.6-inch (4-cm) fetus during a Wednesday ultrasound, the zoo said in a statement. [Photo/Agencies]