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Hoatzin nestling locomotion: Acquisition of quadrupedal limb coordination in birds

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Abstract
The evolution of flight in birds involves (i) decoupling of the primitive mode of quadrupedal locomotor coordination, with a new synchronized flapping motion of the wings while conserving alternating leg movements, and (ii) reduction of wing digits and loss of functional claws. Our observations show that hoatzin nestlings move with alternated walking coordination of the four limbs using the mobile claws on their wings to anchor themselves to the substrate. When swimming, hoatzin nestlings use a coordinated motion of the four limbs involving synchronous or alternated movements of the wings, indicating a versatile motor pattern. Last, the proportions of claws and phalanges in juvenile hoatzin are radically divergent from those in adults, yet strikingly similar to those of Archaeopteryx. The locomotor plasticity observed in the hoatzin suggests that transitional forms that retained claws on the wings could have also used them for locomotion.
Keywords
3D, skeleton, hoazin, locomotion, motor control, anatomy, biomechanics

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Chicago
Abourachid, Anick, Anthony Herrel, Thierry Decamps, Fanny Pages, Anne-Claire Fabre, Luc Van Hoorebeke, Dominique Adriaens, and Maria Alexandra Garcia Amado. 2019. “Hoatzin Nestling Locomotion: Acquisition of Quadrupedal Limb Coordination in Birds.” Science Advances 5 (5).
APA
Abourachid, A., Herrel, A., Decamps, T., Pages, F., Fabre, A.-C., Van Hoorebeke, L., Adriaens, D., et al. (2019). Hoatzin nestling locomotion: Acquisition of quadrupedal limb coordination in birds. Science Advances, 5(5).
Vancouver
1.
Abourachid A, Herrel A, Decamps T, Pages F, Fabre A-C, Van Hoorebeke L, et al. Hoatzin nestling locomotion: Acquisition of quadrupedal limb coordination in birds. Science Advances. American Association for the Advancement of Science (AAAS); 2019;5(5).
MLA
Abourachid, Anick et al. “Hoatzin Nestling Locomotion: Acquisition of Quadrupedal Limb Coordination in Birds.” Science Advances 5.5 (2019): n. pag. Print.
@article{8616934,
  abstract     = {The evolution of flight in birds involves (i) decoupling of the primitive mode of quadrupedal locomotor coordination, with a new synchronized flapping motion of the wings while conserving alternating leg movements, and (ii) reduction of wing digits and loss of functional claws. Our observations show that hoatzin nestlings move with alternated walking coordination of the four limbs using the mobile claws on their wings to anchor themselves to the substrate. When swimming, hoatzin nestlings use a coordinated motion of the four limbs involving synchronous or alternated movements of the wings, indicating a versatile motor pattern. Last, the proportions of claws and phalanges in juvenile hoatzin are radically divergent from those in adults, yet strikingly similar to those of Archaeopteryx. The locomotor plasticity observed in the hoatzin suggests that transitional forms that retained claws on the wings could have also used them for locomotion.},
  articleno    = {eaat0787},
  author       = {Abourachid, Anick and Herrel, Anthony and Decamps, Thierry and Pages, Fanny and Fabre, Anne-Claire and Van Hoorebeke, Luc and Adriaens, Dominique and Garcia Amado, Maria Alexandra},
  issn         = {2375-2548},
  journal      = {Science Advances},
  number       = {5},
  publisher    = {American Association for the Advancement of Science (AAAS)},
  title        = {Hoatzin nestling locomotion: Acquisition of quadrupedal limb coordination in birds},
  url          = {http://dx.doi.org/10.1126/sciadv.aat0787},
  volume       = {5},
  year         = {2019},
}

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