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Building a Bird: Musculoskeletal Modeling and Simulation of Wing-Assisted Incline Running During Avian Ontogeny.

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Young birds use their developing wings for enhanced leg performance and early flight. Their locomotion is limited by feather development, not muscle capacity, according to biomechanical modeling.

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Area of Science:

  • Biomechanics
  • Evolutionary Biology
  • Developmental Biology

Background:

  • Flapping flight is power-intensive, requiring specialized adult bird anatomy.
  • Developing birds utilize forelimbs for locomotion before flight adaptations emerge.
  • Understanding anatomical development's role in juvenile bird locomotion is challenging empirically.

Purpose of the Study:

  • To investigate how ontogenetic changes in anatomy influence locomotor capacity in juvenile birds.
  • To analyze the ontogeny of pectoral limb function in the precocial ground bird, *Alectoris chukar*.
  • To examine the interplay of muscular, skeletal, and aerodynamic forces during juvenile avian locomotion.

Main Methods:

  • Combined empirical data (muscle morphology, kinematics, aerodynamics) with advanced biomechanical modeling and simulation.
  • Developed musculoskeletal models to simulate wing-assisted incline running (WAIR).
  • Manipulated anatomical parameters to assess functional consequences of morphological changes.

Main Results:

  • Immature birds exhibit excess muscle capacity for locomotion.
  • Feather morphology appears to be a primary limitation on locomotor performance in juvenile birds.
  • Feather growth dynamics may differ significantly from bone and muscle development.

Conclusions:

  • Muscular and aerodynamic forces interact with the skeletal system to enable movement in developing birds.
  • Feather development, not muscle capacity, is a key factor in juvenile avian locomotion.
  • Provides a benchmark for biomechanical modeling of locomotion in extant and extinct species.