Butterly specimens are on display at Shanghai Natural History Museum in East China's Shanghai, April 11, 2015. 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. [Photo/Xinhua]