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Dinosaurian growth rates and bird origins

Author

Listed:
  • Kevin Padian

    (University of California)

  • Armand J. de Ricqlès

    (Équipe Formations Squelettiques, UMR 8570 CNRS, Université
    Collège de France)

  • John R. Horner

    (Museum of the Rockies, Montana State University)

Abstract

Dinosaurs, like other tetrapods, grew more quickly just after hatching than later in life. However, they did not grow like most other non-avian reptiles, which grow slowly and gradually through life. Rather, microscopic analyses of the long-bone tissues show that dinosaurs grew to their adult size relatively quickly, much as large birds and mammals do today. The first birds reduced their adult body size by shortening the phase of rapid growth common to their larger theropod dinosaur relatives. These changes in timing were primarily related not to physiological differences but to differences in growth strategy.

Suggested Citation

  • Kevin Padian & Armand J. de Ricqlès & John R. Horner, 2001. "Dinosaurian growth rates and bird origins," Nature, Nature, vol. 412(6845), pages 405-408, July.
    • Handle: RePEc:nat:nature:v:412:y:2001:i:6845:d:10.1038_35086500
    DOI: 10.1038/35086500
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