A Precocial Avian Embryo from the Lower Cretaceous of China

@article{Zhou2004APA,
  title={A Precocial Avian Embryo from the Lower Cretaceous of China},
  author={Zhonghe Zhou and Fucheng Zhang},
  journal={Science},
  year={2004},
  volume={306},
  pages={653 - 653}
}
An embryo of an enantiornithine bird has been recovered from the Lower Cretaceous rocks of Liaoning, in northeast China. The bird has a nearly complete articulated skeleton with feather sheet impressions and is enclosed in egg-shaped confines. The tucking posture of the skeleton suggests that the embryo had attained the final stage of development. The presence of well-developed wing and tail feather sheets indicates a precocial developmental mode, supporting the hypothesis that precocial birds… Expand
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