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Progress
Nature 412, 405-408 (26 July 2001) | doi:10.1038/35086500
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Deputy Chief Scientific Advisor and Deputy Director of Research
- UK Department for International Development
- London, United Kingdom
Gastrointestinal / Liver Pathologist / Surgical Pathologist
- Tulane University Health Sciences Center
- Tulane, Louisiana, USA
Dinosaurian growth rates and bird origins
Kevin Padian1, Armand J. de Ricqlès2 & John R. Horner3
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.
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