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  • Title: Minute theropod eggs and embryo from the Lower Cretaceous of Thailand and the dinosaur-bird transition.
    Author: Buffetaut E, Grellet-Tinner G, Suteethorn V, Cuny G, Tong H, Kosir A, Cavin L, Chitsing S, Griffiths PJ, Tabouelle J, Le Loeuff J.
    Journal: Naturwissenschaften; 2005 Oct; 92(10):477-82. PubMed ID: 16158273.
    Abstract:
    We report on very small fossil eggs from the Lower Cretaceous of Thailand, one of them containing a theropod embryo, which display a remarkable mosaic of characters. While the surficial ornamentation is typical of non-avian saurischian dinosaurs, the three-layered prismatic structure of the eggshell is currently known only in extant and fossil eggs associated with birds. These eggs, about the size of a goldfinch's, mirror at the reproductive level the retention of small body size that was paramount in the transition from non-avian theropods to birds. The egg-layer may have been a small feathered theropod similar to those recently found in China.
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