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  • Title: Palaeontology: pterosaur egg with a leathery shell.
    Author: Ji Q, Ji SA, Cheng YN, You HL, Lü JC, Liu YQ, Yuan CX.
    Journal: Nature; 2004 Dec 02; 432(7017):572. PubMed ID: 15577900.
    Abstract:
    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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