Ancient Flightless Bird Challenges Understanding of Wing Evolution

A remarkable fossil discovery in China has revealed a 148-150 million-year-old flightless bird species, Yuezhuornis yangyuanensis. This ancient bird, about half a meter tall and weighing over 800 grams, is believed to have lived in a swampy environment and was likely a good runner. The researchers found that Y. yangyuanensis is most similar to modern ground-dwelling pheasants, with forelimbs shorter than its hindlimbs. The discovery suggests that the evolution of birds and flight may not have proceeded in a straight line, and that early species may have explored different niches and specialisations, including lifestyles that didn't involve flying.