title: Locomotor preferences in terrestrial vertebrates: An online crowdsourcing approach to data collection.
abstract: Understanding how animals move within their environment is a burgeoning field of research. Despite this, relatively basic data, such as the locomotor speeds that animals choose to walk at in the wild, are sparse. If animals choose to walk with dynamic similarity, they will move at equal dimensionless speeds, represented by Froude number (Fr). Fr may be interpreted from simple limb kinematics obtained from video data. Here, using Internet videos, limb kinematics were measured in 112 bird and mammal species weighing between 0.61 and 5400 kg. This novel method of data collection enabled the determination of kinematics for animals walking at their self-selected speeds without the need for exhaustive fieldwork. At larger sizes, both birds and mammals prefer to walk at slower relative speeds and relative stride frequencies, as preferred Fr decreased in larger species, indicating that Fr may not be a good predictor of preferred locomotor speeds. This may result from the observation that the minimum cost of transport is approached at lower Fr in larger species. Birds walk with higher duty factors, lower stride frequencies and longer stance times compared to mammals at self-selected speeds. The trend towards lower preferred Fr is also apparent in extinct vertebrate species.
authors.affiliation: Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, UK.
authors.forename: John
authors.initials: J
authors.lastname: Lees
authors.affiliation: School of Computing, Science and Engineering, University of Salford, Salford, M5 4WT, UK.
authors.forename: James
authors.initials: J
authors.lastname: Gardiner
authors.affiliation: Structure and Motion Laboratory, The Royal Veterinary College, University of London, North Mymms, Hatfield, Herts, AL9 7TA, UK.
authors.forename: James
authors.initials: J
authors.lastname: Usherwood
authors.affiliation: Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, UK.
authors.forename: Robert
authors.initials: R
authors.lastname: Nudds
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D001717:Birds; D063045:Crowdsourcing; D005684:Gait; D008124:Locomotion; D008322:Mammals / Q000502:physiology*; D008962:Models, Theoretical; D012984:Software; D014714:Vertebrates / Q000502:physiology*; D014741:Video Recording; D016138:Walking