Abourachid, A. & Höfling, E. The legs: a key to bird evolutionary success. J. Ornithol. 153, 193–198 (2012).
Nie, C., Corcho, X. P. & Spenko, M. Robots on the move: versatility and complexity in mobile robot locomotion. IEEE Robot. Autom. Mag. 20, 72–82 (2013).
Kim, K., Spieler, P., Lupu, E.-S., Ramezani, A. & Chung, S.-J. A bipedal walking robot that can fly, slackline, and skateboard. Sci. Robot. 6, eabf8136 (2021).
Google Scholar
Roderick, W. R., Cutkosky, M. R. & Lentink, D. Bird-inspired dynamic grasping and perching in arboreal environments. Sci. Robot. 6, eabj7562 (2021).
Google Scholar
Zufferey, R. et al. How ornithopters can perch autonomously on a branch. Nat. Commun. 13, 7713 (2022).
Google Scholar
Heppner, F. H. & Anderson, J. G. Leg thrust important in flight take-off in the pigeon. J. Exp. Biol. 114, 285–288 (1985).
Bonser, R. & Rayner, J. Measuring leg thrust forces in the common starling. J. Exp. Biol. 199, 435–439 (1996).
Google Scholar
Henry, H. T., Ellerby, D. J. & Marsh, R. L. Performance of guinea fowl Numida meleagris during jumping requires storage and release of elastic energy. J. Exp. Biol. 208, 3293–3302 (2005).
Google Scholar
Provini, P., Tobalske, B. W., Crandell, K. E. & Abourachid, A. Transition from leg to wing forces during take-off in birds. J. Exp. Biol. 215, 4115–4124 (2012).
Google Scholar
Kardon, G. Muscle and tendon morphogenesis in the avian hind limb. Development 125, 4019–4032 (1998).
Google Scholar
Dickinson, M. H. et al. How animals move: an integrative view. Science 288, 100–106 (2000).
Google Scholar
Floreano, D. & Wood, R. J. Science, technology and the future of small autonomous drones. Nature 521, 460–466 (2015).
Google Scholar
Roderick, W. R., Chin, D. D., Cutkosky, M. R. & Lentink, D. Birds land reliably on complex surfaces by adapting their foot-surface interactions upon contact. eLife 8, e46415 (2019).
Google Scholar
KleinHeerenbrink, M., France, L. A., Brighton, C. H. & Taylor, G. K. Optimization of avian perching manoeuvres. Nature 607, 91–96 (2022).
Google Scholar
Desbiens, A. L., Pope, M. T., Christensen, D. L., Hawkes, E. W. & Cutkosky, M. R. Design principles for efficient, repeated jumpgliding. Bioinspir. Biomim. 9, 025009 (2014).
Google Scholar
Vidyasagar, A., Zufferey, J.-C., Floreano, D. & Kovač, M. Performance analysis of jump-gliding locomotion for miniature robotics. Bioinspir. Biomim. 10, 025006 (2015).
Google Scholar
Badri-Spröwitz, A., Aghamaleki Sarvestani, A., Sitti, M. & Daley, M. A. BirdBot achieves energy-efficient gait with minimal control using avian-inspired leg clutching. Sci. Robot. 7, eabg4055 (2022).
Google Scholar
Liu, Y. et al. Design and control of a miniature bipedal robot with proprioceptive actuation for dynamic behaviors. In 2022 International Conference on Robotics and Automation 8547–8553 (IEEE, 2022).
Woodward, M. A. & Sitti, M. MultiMo-Bat: a biologically inspired integrated jumping–gliding robot. Int. J. Robot. Res. 33, 1511–1529 (2014).
Haldane, D. W., Plecnik, M. M., Yim, J. K. & Fearing, R. S. Robotic vertical jumping agility via series-elastic power modulation. Sci. Robot. 1, eaag2048 (2016).
Google Scholar
Shin, W. D., Stewart, W., Estrada, M. A., Ijspeert, A. J. & Floreano, D. Elastic-actuation mechanism for repetitive hopping based on power modulation and cyclic trajectory generation. IEEE Trans. Robot. 39, 558–571 (2022).
Hawkes, E. W. et al. Engineered jumpers overcome biological limits via work multiplication. Nature 604, 657–661 (2022).
Google Scholar
Provini, P. & Höfling, E. To hop or not to hop? The answer is in the bird trees. Syst. Biol. 69, 962–972 (2020).
Google Scholar
Dagc, A. I. The walk of the silver gull (Larus novaehollandiae) and of other birds. J. Zool. 182, 529–540 (1977).
Lees, J., Gardiner, J., Usherwood, J. & Nudds, R. Locomotor preferences in terrestrial vertebrates: an online crowdsourcing approach to data collection. Sci. Rep. 6, 28825 (2016).
Google Scholar
Verstappen, M., Aerts, P. & De Vree, F. Functional morphology of the hindlimb musculature of the black-billed magpie, Pica pica (Aves, Corvidae). Zoomorphology 118, 207–223 (1998).
Pieper, D. L. The Kinematics of Manipulators under Computer Control (Stanford Univ., 1969).
Kilbourne, B. M. On birds: scale effects in the neognath hindlimb and differences in the gross morphology of wings and hindlimbs: scale effects in neognath hindlimbs. Biol. J. Linn. Soc. 110, 14–31 (2013).
Hutchinson, J. R. The evolution of hindlimb tendons and muscles on the line to crown-group birds. Comp. Biochem. Physiol. A 133, 1051–1086 (2002).
Backus, S. B., Sustaita, D., Odhner, L. U. & Dollar, A. M. Mechanical analysis of avian feet: multiarticular muscles in grasping and perching. R. Soc. Open Sci. 2, 140350 (2015).
Google Scholar
Askew, G. N., Marsh, R. L. & Ellington, C. P. The mechanical power output of the flight muscles of blue-breasted quail (Coturnix chinensis) during take-off. J. Exp. Biol. 204, 3601–3619 (2001).
Google Scholar
Bachmann, R. J., Boria, F. J., Vaidyanathan, R., Ifju, P. G. & Quinn, R. D. A biologically inspired micro-vehicle capable of aerial and terrestrial locomotion. Mech. Mach. Theory 44, 513–526 (2009).
Daler, L., Mintchev, S., Stefanini, C. & Floreano, D. A bioinspired multi-modal flying and walking robot. Bioinspir. Biomim. 10, 016005 (2015).
Google Scholar
Karydis, K. & Kumar, V. Energetics in robotic flight at small scales. Interface Focus 7, 20160088 (2017).
Google Scholar
Watson, R. R. et al. Gait-specific energetics contributes to economical walking and running in emus and ostriches. Proc. R. Soc. B 278, 2040–2046 (2011).
Google Scholar
Rubenson, J. et al. Reappraisal of the comparative cost of human locomotion using gait-specific allometric analyses. J. Exp. Biol. 210, 3513–3524 (2007).
Google Scholar
Tobalske, B. W. & Dial, K. P. Effects of body size on take-off flight performance in the Phasianidae (Aves). J. Exp. Biol. 203, 3319–3332 (2000).
Google Scholar
Heers, A. M. & Dial, K. P. Wings versus legs in the avian bauplan: development and evolution of alternative locomotor strategies. Evolution 69, 305–320 (2015).
Google Scholar
Dial, K. P. Evolution of avian locomotion: correlates of flight style, locomotor modules, nesting biology, body size, development, and the origin of flapping flight. Auk 120, 941–952 (2003).
Sato, K. et al. Scaling of soaring seabirds and implications for flight abilities of giant pterosaurs. PLoS ONE 4, e5400 (2009).
Google Scholar
Bishop, P. J. et al. The influence of speed and size on avian terrestrial locomotor biomechanics: predicting locomotion in extinct theropod dinosaurs. PLoS ONE 13, e0192172 (2018).
Google Scholar
Tucker, V. A. The energetic cost of moving about: walking and running are extremely inefficient forms of locomotion. Much greater efficiency is achieved by birds, fish—and bicyclists. Am. Sci. 63, 413–419 (1975).
Google Scholar
Kilbourne, B. M. Scale effects and morphological diversification in hindlimb segment mass proportions in neognath birds. Front. Zool. 11, 37 (2014).
Google Scholar
Truong, N. T., Phan, H. V. & Park, H. C. Design and demonstration of a bio-inspired flapping-wing-assisted jumping robot. Bioinspir. Biomim. 14, 036010 (2019).
Google Scholar
Preininger, D., Schoas, B., Kramer, D. & Boeckle, M. Waste disposal sites as all-you-can eat buffets for carrion crows (Corvus corone). Animals 9, 215 (2019).
Google Scholar
Ding, Y. & Park, H.-W. Design and experimental implementation of a quasi-direct-drive leg for optimized jumping. In 2017 IEEE/RSJ International Conference on Intelligent Robots and Systems 300–305 (IEEE, 2017).
Käslin, R., Kolvenbach, H., Paez, L., Lika, K. & Hutter, M. Towards a passive adaptive planar foot with ground orientation and contact force sensing for legged robots. In 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems 2707–2714 (IEEE, 2018).
Askari, M., Shin, W. D., Lenherr, D., Stewart, W. & Floreano, D. Avian-inspired claws enable robot perching or walking. IEEE/ASME Trans. Mechatron. 29, 1856–1866 (2023).
McGhee, R. B. & Frank, A. A. On the stability properties of quadruped creeping gaits. Math. Biosci. 3, 331–351 (1968).
Kaneko, K. et al. Design of prototype humanoid robotics platform for HRP. In IEEE/RSJ International Conference on Intelligent Robots and Systems Vol. 3, 2431–2436 (IEEE, 2002).
Park, I.-W., Kim, J.-Y., Lee, J. & Oh, J.-H. Mechanical design of the humanoid robot platform, HUBO. Adv. Robot. 21, 1305–1322 (2007).
Macaulay, S. et al. Decoupling body shape and mass distribution in birds and their dinosaurian ancestors. Nat. Commun. 14, 1575 (2023).
Google Scholar
Thomas, A. L. & Taylor, G. K. Animal flight dynamics I. Stability in gliding flight. J. Theor. Biol. 212, 399–424 (2001).
Google Scholar
Hutter, M. StarlETH & Co.: Design and Control of Legged Robots with Compliant Actuation (ETH Zurich, 2013).
Slotine, S. B. & Siciliano, B. A general framework for managing multiple tasks in highly redundant robotic systems. In Proc. International Conference on Advanced Robotics Vol. 2, 1211–1216 (IEEE, 1991).
Wampler, C. W. Manipulator inverse kinematic solutions based on vector formulations and damped least-squares methods. IEEE Trans. Syst. Man Cybern. 16, 93–101 (1986).
Righetti, L., Buchli, J., Mistry, M. & Schaal, S. Inverse dynamics control of floating-base robots with external constraints: a unified view. In 2011 IEEE International Conference on Robotics and Automation 1085–1090 (IEEE, 2011).
Smith, N., Wilson, A., Jespers, K. J. & Payne, R. Muscle architecture and functional anatomy of the pelvic limb of the ostrich (Struthio camelus). J. Anat. 209, 765–779 (2006).
Google Scholar
Harvey, C., Baliga, V., Wong, J., Altshuler, D. & Inman, D. Birds can transition between stable and unstable states via wing morphing. Nature 603, 648–653 (2022).
Google Scholar
Morrey, J. M., Lambrecht, B., Horchler, A. D., Ritzmann, R. E. & Quinn, R. D. Highly mobile and robust small quadruped robots. In Proc. 2003 IEEE/RSJ International Conference on Intelligent Robots and Systems Vol. 1, 82–87 (IEEE, 2003).
Neville, N. & Buehler, M. Towards bipedal running of a six legged robot. In 12th Yale Workshop on Adaptive and Learning Systems Vol. 12, 1–7 (Yale University, 2003).
Collins, S. Efficient bipedal robots based on passive-dynamic walkers. Science 307, 1082–1085 (2005).
Google Scholar
Kim, S., Clark, J. E. & Cutkosky, M. R. iSprawl: design and tuning for high-speed autonomous open-loop running. Int. J. Robot. Res. 25, 903–912 (2006).
Birkmeyer, P., Peterson, K. & Fearing, R. S. DASH: a dynamic 16 g hexapedal robot. In 2009 IEEE/RSJ International Conference on Intelligent Robots and Systems 2683–2689 (IEEE, 2009).
Spröwitz, A. et al. Towards dynamic trot gait locomotion: design, control, and experiments with Cheetah-cub, a compliant quadruped robot. Int. J. Robot. Res. 32, 932–950 (2013).
Hutter, M. et al. ANYmal—a highly mobile and dynamic quadrupedal robot. In 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems 38–44 (IEEE, 2016).
Bledt, G. et al. MIT Cheetah 3: design and control of a robust, dynamic quadruped robot. In 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems 2245–2252 (IEEE, 2018).
Shin, W. D., Park, J. & Park, H.-W. Development and experiments of a bio-inspired robot with multi-mode in aerial and terrestrial locomotion. Bioinspir. Biomim. 14, 056009 (2019).
Google Scholar
Yadukumar, S. N., Pasupuleti, M. & Ames, A. D. From formal methods to algorithmic implementation of human inspired control on bipedal robots. In Algorithmic Foundations of Robotics X: Proc. Tenth Workshop on the Algorithmic Foundations of Robotics 511–526 (Springer, 2013).
Reher, J., Cousineau, E. A., Hereid, A., Hubicki, C. M. & Ames, A. D. Realizing dynamic and efficient bipedal locomotion on the humanoid robot DURUS. In 2016 IEEE International Conference on Robotics and Automation 1794–1801 (IEEE, 2016).
Shin, W. D. Data for ‘Fast ground-to-air transition enabled by avian-inspired multifunctional legs’. Zenodo https://doi.org/10.5281/zenodo.13326012 (2024).
Shin, W. D. MATLAB code for jumping takeoff simulation. Zenodo https://doi.org/10.5281/zenodo.13326431 (2024).