【人民日报】恐龙和鸟是否“沾亲带故”

Core Viewpoint - The article discusses the evolutionary link between dinosaurs and birds, highlighting significant fossil discoveries that challenge previous understandings of this relationship [6][8][14]. Group 1: Evolutionary Evidence - The discovery of numerous dinosaur fossils in China has revealed that some dinosaurs had feathers and exhibited early flight capabilities, suggesting that flight was not exclusive to birds [6][10]. - The "Zhenghe Bamin Bird" fossil, discovered in 2025, indicates that modern bird body structures appeared as early as the Late Jurassic, predating previous assumptions by nearly 20 million years [8][14]. - Xu Xing posits that the Archaeopteryx is more closely related to small theropod dinosaurs than to modern birds, with increasing scholarly support for this view [7][10]. Group 2: Survival of Birds - Modern birds survived the mass extinction event 66 million years ago primarily due to their smaller size, which allowed them to find food more easily during periods of scarcity [10][11]. - The survival of birds was also linked to their habitat preferences, as many surviving species lived near water bodies, which provided food sources during the extinction event [11][12]. - Enhanced flight capabilities in surviving bird species allowed them to evade disasters and seek new habitats, leading to a natural selection process that favored stronger flying abilities [11][12]. Group 3: Theories of Flight Origin - Two main hypotheses exist regarding the origin of flight in dinosaurs: the "ground-up" theory, which suggests that running dinosaurs developed wings, and the "tree-down" theory, which posits that tree-dwelling dinosaurs glided down and evolved flight [13][14]. - Xu Xing's research supports the "tree-down" hypothesis, proposing that four-winged dinosaurs were more likely to have evolved from tree-dwelling ancestors [13][14]. Group 4: Ongoing Research and Future Prospects - Current technology does not allow for the revival of dinosaurs, as ancient DNA is not preserved in fossils; however, advancements in synthetic biology may enable the creation of species resembling dinosaurs [12][14]. - Ongoing research aims to uncover more fossil evidence and ancient proteins to better understand the evolutionary transition from dinosaurs to birds [14].