On the kinematics of forelimb landing of frog Rana rugulosus

Xiao, Jingcheng; Lin, Feng; Yao, Li; Li, Bing; Yang, Xiaojun

doi:10.1016/j.jbiomech.2021.110417

Cited by 4 publications

(1 citation statement)

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“…Frogs adopt different landing strategies, but without exception the forelimbs are extended and the hindlegs are recovered for shock‐absorbing (Peters et al, 1996). In the aerial phase of jumping, the body attitudes and limb postures are well adjusted, which is important for landing process (O'Reilly et al, 2000; Xiao et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The aero body righting of frog Rana rugulosus via hindleg swings

Wang

Lin

et al. 2022

J Exp Zool Pt A

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Frogs can keep an excellent aerial balance for landing and achieve consecutive jumps reliably. A safe landing requires an accurate body righting in the air. However, there is no systematic study on how the frogs adjust the aerial postures and body attitudes after jumping. The stretched long hindlegs swung quickly in the aerial phase, which revealed a clear relationship with the body attitudes. This study aimed to verify the function of frogs' hindlegs on aero body righting in the air. We captured the motions of both hindlegs and found the hindlegs adopted two movement modes, the bilateral parallel, and separated swings. The hindleg-induced torques by the two movements were negatively correlated with the body's angular accelerations on pitch and roll, respectively. Moreover, an analytical model was derived based on the conservation of angular momentum and verified by the dynamic simulations. Thus, we confirmed that the hindlegs are the dominant mechanism in aerial pitch and roll controls.We anticipate our achievements to inspire the design of air-righting tools.

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Section: Introductionmentioning

confidence: 99%

The aero body righting of frog Rana rugulosus via hindleg swings

Wang

Lin

et al. 2022

J Exp Zool Pt A

Self Cite

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Tree Frogs Alter Their Behavioral Strategies While Landing On Vertical Perches

Zhou,

Wang,

Song

et al. 2024

J Exp Zool Pt A

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As an arboreal animal, tree frogs face diverse challenges when landing on perches, including variations in substrate shape, diameter, flexibility, and angular distribution, with potentially significant consequences for failed landings. Research on tree frog landing behavior on perches, especially concerning landing on vertical substrates, remains limited. This study investigated the landing strategies (forelimb, abdomen, and hindlimb) of tree frogs on vertical perches, considering perch diameter. Although all three strategies were observed across perches of different diameters, their frequencies differed. Forelimb landing was most common across all perch diameters, with its frequency increasing with perch diameter, while abdomen and hindlimb landing strategies were more prevalent on smaller diameter perches. During the process from take‐off to landing, the body axis underwent some deviation owing to the asymmetric movement of the left and right limbs; however, these deviations did not significantly differ among landing strategies. Additionally, different landing strategies led to variations in the landing forces, with abdominal landings generating significantly higher impact forces than the other two strategies. These findings provide insights into the biomechanics and biological adaptations of tree frogs when landing on challenging substrates, such as leaves or branches.

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