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The Machinery of Animal Movement
A hone can lift a hindfoot without moving
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A. V. Hill aeroplane angle animal moves animal's backwards bird bird's body forward bones centre of gravity cilia depends Diplovertebron dolphin drag earthworm engine equal but opposite fall feet fibres fins fish moves flea flying flying fish foot forces exerted forefeet forefoot frog front end front sucker ft per sec fulcrum glass tube gliding birds gliding flight hind sucker hindfeet hindfoot hindlegs hindlimbs hinge horizontal horse joint kangaroo kinetic energy knee land-living leaves the ground leech legs length levers lift lifting force lizard load long jump longitudinal muscles lung fishes motion moves forward mudskipper muscles shorten muscular newts paddle pectoral fins photographs Plate propel propulsion pterodactyl push relative rigid runners side to side slope smooth snake standing long jump surface swinging forward tail tail-fin take-off speed thrust trout upwards vertebrate vertical walking wards weight wheels whilst wind wings