Animal engine

File:Ox powered treadwheel.JPG powered treadwheel]]

An animal engine is a machine powered by an animal. Horses, donkeys, oxen, dogs, and humans have all been used in this way.{{Cite book|title=Farm Motors: steam and gas engines, hydraulic and electric motors, automobiles, animal motors, windmils.|url=https://archive.org/details/farmmotorssteamg00pott|last=Potter|first=A|publisher=McGraw Hill Book Co|year=1917|location=New York}}{{Cite journal|last1=Braford|first1=B|last2= Major|first2=B |last3=Kenneth|first3=M|date=1979|title=Animal Powered Engines|journal=Technology and Culture|volume=20|issue=2|pages=359–360|doi=10.2307/3103873|jstor=3103873}}{{Cite book|title=The Making of Urban America|last=Mohl|first=Raymond A.|publisher=Rowman & Littlefield|year=1997|isbn=978-0742552357|location=Lanham|edition=3}}{{Cite book|title=An Encyclopedia of the History of Technology|last=McNeil|first=Ian|publisher=Routledge|year=2002|isbn=978-1134981656|location=London}} An unusual example of an animal engine was recorded at Portland, Victoria in 1866. A kangaroo had been tamed and trained to work a treadmill which drove various items of machinery.{{Cite newspaper The Times |title=Australia |date=16 March 1866 |page=5 |issue=25447 |column=F }}