A group of 13 dinosaurs that died in a mud pit in China has yielded an unprecedented discovery.
원문출처 : http://www.cnn.com/2016/12/22/health/dinosaurs-that-lose-teeth-china-trnd/index.html
원문출처 : http://www.cnn.com/2016/12/22/health/dinosaurs-that-lose-teeth-china-trnd/index.html