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Cursoriality in bipedal archosaurs.

T D Jones1, J O Farlow, J A Ruben

  • 1Zoology Department, Oregon State University, Corvallis 97331, USA. tdjones@sfasu.edu

Nature
|August 30, 2000
PubMed
Summary
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Modern birds and some dinosaurs like Caudipteryx exhibit unique running styles. Caudipteryx likely ran like modern birds due to its anterior center of mass and hindlimb proportions, differing from other bipedal dinosaurs.

Area of Science:

  • Paleontology
  • Biomechanics
  • Evolutionary Biology

Background:

  • Modern birds possess anteriorly centered body mass and foreshortened tails for flight stability.
  • This anterior center of mass presents balance challenges for cursorial (running) birds, necessitating unique locomotor adaptations.
  • Bipedal dinosaurs typically had a center of mass near the hip and utilized whole hindlimb rotation for locomotion.

Purpose of the Study:

  • To investigate the relationship between hindlimb length and cursorial locomotion in birds and dinosaurs.
  • To determine the probable running mechanism of Caudipteryx based on its morphology.
  • To explore the evolutionary implications of Caudipteryx's cursorial adaptations.

Main Methods:

  • Comparative analysis of hindlimb proportions and center of mass in modern birds and fossil dinosaurs.

Related Experiment Videos

  • Biomechanical modeling to infer locomotory strategies based on skeletal morphology.
  • Examination of Caudipteryx's specific anatomical features related to locomotion.

    • Main Results:

    • Cursorial birds exhibit longer relative hindlimb lengths compared to bipedal dinosaurs.
    • Caudipteryx possessed an anterior center of mass and hindlimb proportions similar to cursorial birds.
    • These findings suggest Caudipteryx employed a running style akin to modern birds, distinct from other bipedal dinosaurs.

    Conclusions:

    • Hindlimb length and center of mass are critical factors differentiating avian and dinosaurian cursoriality.
    • Caudipteryx's unique morphology indicates a running mechanism more closely related to modern birds.
    • This study offers insights into the evolution of bipedal locomotion and its variations in extinct theropods.