Hans was a horse owned by Wilhelm von Osten, who was a gymnasium mathematics teacher, an amateur horse trainer and phrenologist and was considered to be a mystic. Hans was said to have been taught to add, subtract, multiply, divide, work with fractions, tell the time, keep track of the calendar, differentiate between musical tones, and read, spell, and understand German. Von Osten would ask Hans, "If the eighth day of the month comes on a Tuesday, what is the date of the following Friday?" Hans would answer by tapping his hoof eleven times. Questions could be asked both orally and in written form. Von Osten exhibited Hans throughout Germany and never charged admission. Hans' abilities were reported in The New York Times in 1904.[3]

After von Osten died in 1909, Hans was acquired by several owners. He was then drafted into World War I as a military horse and "killed in action in 1916 or was consumed by hungry soldiers".[4]

(http://www.autoadmit.com/thread.php?thread_id=5806240&forum_id=2Elisa#49483777)