“天空不留下鸟的痕迹,但我已经飞过”——这是泰戈尔诗集中的名句。当你仰望苍穹的时候,是否也会对着那片蔚蓝冥思苦想?亿万年前的空中,有哪些鸟儿曾振翅高飞?它们长什么模样?以什么为食?本文将带领大家走近辽西热河生物群,解读古鸟类化石这本无字史书。在现生脊椎动物中,鸟类是仅次于鱼类的第二大类群,约有10000多种,广泛分布于世界各地。鸟类大多身披色彩斑斓的羽毛,拥有悦耳的叫声,并且善于飞行,因此深受人们的喜爱。 “The sky does not leave traces of the bird, but I’ve flown over” - this is a famous verse in Tagore’s poetry. When you look up at the sky, is it also facing the piece of blue meditation bitterly? Hundreds of millions of years ago in the air, what birds have fluttered their wings? What they look like and what to eat? This article will lead everyone approached Liaoning Rehebi biota, ancient bird fossils interpretation of this wordless history book. Among the vertebrates present, birds are the second largest group after the fish, with more than 10,000 species and are widely distributed throughout the world. Most of the birds are wearing colorful feathers, with sweet sounds and good at flying, so loved by the people.