A visitor takes photos of replicas of dinosaur skeletons on display at the Shanghai Natural History Museum during its preview in Shanghai, China, 17 A

A visitor takes photos of replicas of dinosaur skeletons on display at the Shanghai Natural History Museum during its preview in Shanghai, China, 17 April 2015. Shanghai Natural History Museum had to twice halt ticket sales on its opening day on Sunday (19 April 2015) as it was swamped with visitors. Officials said 10, 400 people visited the new museum in Jing¯an Sculpture Park in downtown Jing¯an District. Attractions include dinosaur models that move and roar and numerous interactive multimedia displays allowing visitors to get close to exhibits. The museum, newly opened on April 19, 2015, has a collection of near 290, 000 samples, including a complete specimen of a 140-million-year-old dinosaur skeleton of Mamenchisaurus. There are also rare specimens which cannot be found elsewhere outside China, such as Yellow River mammoth, giant salamander, giant panda, and Yangtze Alligator.