Jurassic fossil found in east China challenges assumptions about early bird evolution在中国东部发现的侏罗纪化石挑战了关于早期鸟类演化的假设
BEIJING: A newly unearthed Jurassic fossil from east China is prompting scientists to rethink one of the most basic assumptions about bird evolution: that early birds always evolved toward better flight capability.
Life reconstruction of the Late Jurassic bird Yuezhuornis yangyuanensis. - Image by Chung-Tat Cheung/Chinese Academy of Sciences
BEIJING: A newly unearthed Jurassic fossil from east China is prompting scientists to rethink one of the most basic assumptions about bird evolution: that early birds always evolved toward better flight capability.
The 150-million-year-old bird, named Yuezhuornis yangyuanensis, was about the size of a crow and lived during the Late Jurassic period. The fossil was found in Zhenghe County, east China's Fujian Province. What makes this bird so surprising is not how well it flew, but the fact that it likely did not fly at all.
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晚侏罗世鸟类阳源岳竹鸟（Yuezhuornis yangyuanensis）的复原图。——图片由张忠达/中国科学院提供。
北京：中国东部新近出土的一块侏罗纪化石促使科学家们重新思考关于鸟类进化的最基本假设之一：早期鸟类总是朝着更好的飞行能力进化。
这只生活在1.5亿年前的鸟类，名为阳源岳鸟（Yuezhuornis yangyuanensis），体型与乌鸦相仿，生活在侏罗纪晚期。化石发现于中国东部福建省正和县。这只鸟最令人惊讶之处并非在于它飞行能力有多强，而在于它很可能根本不会飞。
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