Do you imagine Farmer Joe sitting on a tractor?
Or does your mind go somewhere more traditional, to a stomping oxen or a horse-drawn plow?
Animal, or draft, power used to play a central role in American agriculture, but in the last sixty or seventy years, machines have taken over.
Many Amish and Mennonite communities never stopped using draft power, but now a new generation of young farmers is taking it up as well.
Stephen Leslie is the author of The New Horse-Powered Farm and an enthusiastic advocate of animal-driven agriculture.