People enter the Shanghai Natural History Museum, which has its exterior wall designed as the shape of cell nucleus, in east China's Shanghai on April 17, 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

Specimens of sea creatures are on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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. hoto: Xinhua

A macaque cyclopis specimen is on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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

People visit the Shanghai Natural History Museum during its preview in east China's Shanghai on April 17, 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

People visit the Shanghai Natural History Museum during its preview in east China's Shanghai on April 17, 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

People visit the Shanghai Natural History Museum during its preview in east China's Shanghai on April 17, 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

A Siberian tiger specimen is on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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

A visitor takes photos of a koala specimen at the Shanghai Natural History Museum during its preview in east China's Shanghai on April 17, 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. hoto: Xinhua

Photo taken on April 17, 2015 shows the exterior of Shanghai Natural History Museum in east China's Shanghai. 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

Specimens of kangaroos are on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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

People visit the Shanghai Natural History Museum during its preview in east China's Shanghai on April 17, 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

A specimen of varanus giganteus perentie is on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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

Specimens of African animals are on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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. hoto: Xinhua

People visit the Shanghai Natural History Museum during its preview in east China's Shanghai on April 17, 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

Specimens of African animals are on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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. hoto: Xinhua

People visit the Shanghai Natural History Museum during its preview in east China's Shanghai on April 17, 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

A specimen of a red-cheeked squirrel is on display at Shanghai Natural History Museum in east China's Shanghai, April 17, 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

Dinosaur models 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

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

Dinosaur models 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