A 150-million-year-old fossil discovered in China provides new insights into avian evolution. The fossil, dating back to the Jurassic period, reveals a transitional stage in the development of the pygostyle, a fused tailbone structure found in modern birds but absent in most non-avian dinosaurs. This discovery, published in Science Advances, helps fill a gap in understanding how birds evolved their distinct skeletal features for flight. AI
RANK_REASON The cluster describes a scientific paper detailing a fossil discovery relevant to evolutionary biology. [lever_c_demoted from research: ic=1 ai=0.1]
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