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Hoatzin nestling locomotion

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Old Thursday 23rd May 2019, 04:33   #1
Fred Ruhe
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Hoatzin nestling locomotion

Anick Abourachid, 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 22 May 2019:
Vol. 5, no. 5, eaat0787
DOI: 10.1126/sciadv.aat0787

https://advances.sciencemag.org/content/5/5/eaat0787

Free pdf:
https://advances.sciencemag.org/cont...t0787.full.pdf

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.

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Old Sunday 2nd June 2019, 08:41   #2
Fred Ruhe
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Nala Rogers, Staff Writer, 2019

The Baby Birds That Use Wing-Claws to Climb Through the Amazon

Inside Science

https://www.insidescience.org/news/b...through-amazon

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