An animal engine is a machine with an animal providing the source of power. Animals commonly used in this way were Horses, Donkeys, Oxen, and Dogs. Man powered machines can also be considered as animal engines too.
- Animal Powered Machines, J. Kenneth Major. Shire Album 128 - Shire Publications 1985. ISBN 0-85263-710-1
- Water-mills windmills and horse-mills of South Africa, James Walton. C Struik Publishers, 1974. ISBN 0-86977-040-3