A piece of fossil specimen is seen at an exhibition in National Wetland Museum of China in Hangzhou, capital of east China's Zhejiang Province, Feb. 13, 2011. Over 500 pieces of specimen were exhibited on a fossil specimens exhibition opened here on Saturday. (Xinhua/Xu Yu)

Visitors look at a model triceratops at an exhibition in National Wetland Museum of China in Hangzhou, capital of east China's Zhejiang Province, Feb. 13, 2011. Over 500 pieces of specimen were exhibited on a fossil specimens exhibition opened here on Saturday. (Xinhua/Huang Zongzhi)

A piece of fossil specimen is seen at an exhibition in National Wetland Museum of China in Hangzhou, capital of east China's Zhejiang Province, Feb. 13, 2011. Over 500 pieces of specimen were exhibited on a fossil specimens exhibition opened here on Saturday. (Xinhua/Xu Yu)

Photo taken on Feb. 13, 2011 shows dinosaur models at an exhibition in National Wetland Museum of China in Hangzhou, capital of east China's Zhejiang Province. Over 500 pieces of specimen were exhibited on a fossil specimens exhibition opened here on Saturday. (Xinhua/Xu Yu)

Photo taken on Feb. 13, 2011 shows the exhibition hall of a fossil specimen exhibition in National Wetland Museum of China in Hangzhou, capital of east China's Zhejiang Province. Over 500 pieces of specimen were exhibited on a fossil specimens exhibition opened here on Saturday. (Xinhua/Xu Yu)