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The Machinery of Animal Movement
Walking and Running
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A. V. Hill acceleration aeroplane angle animal moves animal's bend bird's body forwards bones centre of gravity depends digitigrade drag forces driving the body earthworm engine equal but opposite fall feet figure fins flea flying fish foot forces exerted forefeet forward speed frog front end glass tube gliding birds gliding flight grass-snake heel hind hindfeet hindlegs hindlimbs hinge horizontal horse joint jumper kangaroo kinetic energy knee land-living leaves the ground legs length levers lifting force limb movements lizards load long jump losing height millipede motion moves forward mudskipper muscles shorten muscular newt pectoral fins photographs Plate propel propulsion pterodactyl pull of gravity push relative retractor retractor muscles right forefoot right hindfoot sideways sinuous slope smooth snake standing long jump stroke sucker surface swim swinging forward tail tail-fin take-off speed thrust upwards ventral scales vertical walking weight whilst wind wings