De motu animalis On the gait of animals by Aristotle.
Whitefish: Kessinger Publishing, LLC (May 23, 2010); 2004. ISBN 978-1161446173.
Now of animals which change their position some move with the whole body at once, for example jumping animals, others move one part first and then the other, for example walking (and running) animals. In both these changes the moving creature always changes its position by pressing against what lies below it.
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