Tree frogs (Polypedates dennysi) landing on horizontal perches: the effects of perch diameter

Author:

Song Yi1ORCID,Zhou Rui2,Qiu Ye1,Chen Jian2,Dai Zhendong2ORCID,Wu Huaping1ORCID,Gorb Stanislav N.3ORCID

Affiliation:

1. College of Mechanical Engineering, Zhejiang University of Technology 1 , 18 Chaowang Road, Hangzhou 310014 , China

2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics 2 , 29 Yudao Street, Nanjing 210016 , China

3. Kiel University 3 Department of Functional Morphology and Biomechanics , , Am Botanischen Garten 1-9, D-24118 Kiel , Germany

Abstract

ABSTRACT Secure landing is indispensable for both leaping animals and robotics. Tree frogs, renowned for their adhesive capabilities, can effectively jump across intricate 3D terrain and land safely. Compared with jumping, the mechanisms underlying their landing technique, particularly in arboreal environments, have remained largely unknown. In this study, we focused on the landing patterns of the tree frog Polypedates dennysi on horizontally placed perches, explicitly emphasizing the influence of perch diameters. Tree frogs demonstrated diverse landing postures, including the utilization of: (1) single front foot, (2) double front feet, (3) anterior bellies, (4) middle bellies, (5) posterior bellies, (6) single hind foot, or (5) double hind feet. Generally, tree frogs favoured bellies on slimmer targets but double front feet on large perches. Analysis of limb–trunk relationships revealed their adaptability to modify postures, including body positions and limb orientations, for successful landing. The variations in the initial landing postures affected the subsequent landing procedures and, consequently, the dynamics. As the initial contact position switched from front foot back to the hind foot, the stabilization time decreased at first, reaching a minimum in middle belly landings, and then increased again. The maximum vertical forces showed an inverse trend, whereas the maximum fore–aft forces continuously increased as the initial contact position switched. As the perch diameter increased, the time expended dropped, whereas the maximum impact force increased. These findings not only add to our understanding of frog landings but also highlight the necessity of considering perch diameters and landing styles when studying the biomechanics of arboreal locomotion.

Funder

National Natural Science Foundation of China

Zhejiang Provincial Natural Science Foundation of China

Deutsche Forschungsgemeinschaft

Publisher

The Company of Biologists

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Tree Frogs Alter Their Behavioral Strategies While Landing On Vertical Perches;Journal of Experimental Zoology Part A: Ecological and Integrative Physiology;2024-09-02

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