In the late 1800s, a German high school mathematics instructor and amateur horse trainer, Wilhelm von Osten, had a horse that he claimed was able to perform arithmetic and other intellectual tasks. Clever Hans, an Orlov Trotter, was said to have been taught to add, subtract, multiply, divide, work with fractions, tell time, spell, read, and understand German. Questions were asked orally and in writing, and the horse answered by tapping his foot.
