恐龙向鸟类演化的关键证据“现身”

Core Insights - The research reveals critical evidence for the evolution of dinosaurs into birds through the study of a well-preserved Archaeopteryx specimen, known as the Chicago Archaeopteryx, utilizing high-precision CT scanning technology [1][2] Group 1: Research Findings - The Chicago Archaeopteryx specimen is the 14th known specimen and the smallest, comparable in size to a pigeon, providing unique insights into the morphology and ecological adaptations of early birds [1] - The skull of the specimen is nearly complete, with well-preserved palatal structures, indicating a transitional phase in the evolution of skulls from dinosaurs to birds [2] - The presence of soft tissue traces, particularly the toe pad morphology resembling that of modern terrestrial birds, suggests that the Archaeopteryx had enhanced ground locomotion capabilities [2] Group 2: Evolutionary Significance - The specimen is the first to exhibit tertiary flight feathers, which are believed to improve aerodynamic efficiency during flight, indicating a new evolutionary adaptation for active flight [2] - The findings contribute to understanding the functional aspects of fossilized bird skulls and the evolutionary transition from non-avian dinosaurs to birds [2]