Palaeontology: Pterosaur egg with a leathery shell

@article{Ji2004PalaeontologyPE,
  title={Palaeontology: Pterosaur egg with a leathery shell},
  author={Qiang Ji and Shu-an Ji and Yen-nien Cheng and Hailu You and Jun-chang L{\"u} and Yong-Qing Liu and Chong-xi Yuan},
  journal={Nature},
  year={2004},
  volume={432},
  pages={572-572}
}
The recent discovery of a pterosaur egg with embryonic skeleton and soft tissues from the Yixian Formation confirmed that the flying pterosaurs were oviparous. Here we describe another pterosaur egg whose exquisite preservation indicates that the shell structure was soft and leathery. 
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