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Forelimb motion and reciprocation mediate aerodynamic control in a gliding lizard
Erik A Sathe1,2, Robert Dudley3,4,5
1Department of Integrative Biology, University of California, Berkeley, Berkeley, USA. eksathe@berkeley.edu.
BMC Ecology and Evolution
|November 6, 2025
Summary
Gliding geckos use forelimb movements to control speed and generate thrust, offering insights into the evolution of vertebrate flight. These findings suggest limb motions preceded true wings in the development of powered flight.
Area of Science:
- Evolutionary biology
- Biomechanics
- Vertebrate flight
Background:
- The evolutionary origin of powered flight in vertebrates remains unclear.
- Forelimb control of aerodynamic forces during gliding may represent a precursor to flapping flight.
Purpose of the Study:
- To model gliding taxa ancestral to flying vertebrates using flat-tailed house geckos (Hemidactylus platyurus).
- To characterize limb and body kinematics during gliding in a vertical wind tunnel.
- To determine biomechanical consequences of forelimb movements in aerial behavior.
Main Methods:
- Utilized flat-tailed house geckos (Hemidactylus platyurus) as a model organism.
- Recorded limb and body kinematics during gliding in a vertical wind tunnel.
- Analyzed correlations between forelimb movements, body posture, and aerodynamic forces.
Main Results:
- Geckos adopted a skydiving posture, flexing their bodies ventrally during forelimb retraction.
- Shoulder retraction and spinal flexion correlated with vertical and cranial velocity, producing horizontal thrust.
- Body pitch changes influenced vertical and horizontal accelerations.
Conclusions:
- Gliding geckos actively manipulate forelimbs to alter speed and generate thrust.
- Forelimb movements provide aerodynamic functions in the absence of wings.
- Analogous forelimb motions may have offered biomechanical advantages in the evolution of flying vertebrates.
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