恐龙是地球上一类曾经称霸陆地的统治者。恐龙最早出现于三叠纪晚期(2.3亿年前),繁荣于侏罗纪和白垩纪,灭绝于白垩纪末期(6550万年前),在地球上存在了大约1.7亿年,是地球历史上最庞大和最成功的类群之一。最新的研究表明,恐龙在中生代末期的大绝灭中可能并非全部绝灭,而是有一类演化成了鸟类幸存了下来。恐龙以其地理分布广泛、化石埋藏丰富、个体形态多样、体型巨大奇特和神秘集 Dinosaurs are a type of ruler on Earth who once dominated the land. Dinosaurs first appeared in the Late Triassic (230 million years ago), prospered in the Jurassic and Cretaceous, extinct at the end of the Cretaceous (65.5 million years ago), there are about 170 million years on Earth, is the history of the earth One of the largest and most successful groups. The latest research shows that the dinosaurs may not all be extinct during the Great Extinction of the Mesozoic Era, but rather that one species has evolved into a bird that survived. Dinosaurs are widely distributed in geography, rich in fossil burial, diverse and diverse in form, hugely peculiar in body and mysterious set