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Birds land reliably on complex surfaces by adapting their foot-surface interactions upon contact.
Roderick, William Rt; Chin, Diana D; Cutkosky, Mark R; Lentink, David.
Afiliación
  • Roderick WR; Department of Mechanical Engineering, Stanford University, Stanford, United States.
  • Chin DD; Department of Mechanical Engineering, Stanford University, Stanford, United States.
  • Cutkosky MR; Department of Mechanical Engineering, Stanford University, Stanford, United States.
  • Lentink D; Department of Mechanical Engineering, Stanford University, Stanford, United States.
Elife ; 82019 08 06.
Article en En | MEDLINE | ID: mdl-31385573
Birds land on a wide range of complex surfaces, yet it is unclear how they grasp a perch reliably. Here, we show how Pacific parrotlets exhibit stereotyped leg and wing dynamics regardless of perch diameter and texture, but foot, toe, and claw kinematics become surface-specific upon touchdown. A new dynamic grasping model, which integrates our detailed measurements, reveals how birds stabilize their grasp. They combine predictable toe pad friction with probabilistic friction from their claws, which they drag to find surface asperities-dragging further when they can squeeze less. Remarkably, parrotlet claws can undergo superfast movements, within 1-2 ms, on moderately slippery surfaces to find more secure asperities when necessary. With this strategy, they first ramp up safety margins by squeezing before relaxing their grasp. The model further shows it is advantageous to be small for stable perching when high friction relative to normal force is required because claws can find more usable surface, but this trend reverses when required friction shrinks. This explains how many animals and robots may grasp complex surfaces reliably.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Loros / Alas de Animales / Pie / Actividad Motora Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Elife Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Loros / Alas de Animales / Pie / Actividad Motora Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Elife Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido