Meng Meng, Berlin Zoo’s female giant panda, is expecting twin cubs, an ultrasound examination has revealed, the zoo authorities announced on Tuesday. “Following weeks of tense expectation, there was a minor celebration in Berlin Zoo’s Panda Garden on Sunday morning,” they reported. The cubs will be the first to be born at the zoo in central Berlin in five years. “One heartbeat could initially be made out on the ultrasound equipment, and shortly thereafter a second as well,” they added. The cubs are just 2.5 centimetres long at the moment and will grow considerably before birth. Meng Meng last …