现今地球上,生存着约9000余种鸟类,但在地史中鸟类却很难被保存为化石。中生代的原始鸟类化石尤其稀少。在地学史上,最早的鸟被称为始祖鸟。目前,公认的最早的原始鸟类化石发现于德国巴伐利亚索伦霍芬地区晚侏罗世石灰岩中,迄今仅发现6件。在 Today, about 9,000 species of birds live on Earth, but birds are rarely preserved as fossils in native history. The Mesozoic primitive bird fossils are particularly sparse. In the history of geology, the earliest bird is called the Archeopteryx. At present, the earliest recognized original bird fossils were found in the Late Jurassic limestone in the Sohrenhofen area of ​​Bavaria, Germany, of which only 6 have been found so far. in