In one of Dr. Seuss's later books, what do the characters named the Yooks and the Zooks do differently?

In the anti-war parable The Butter Battle Book, the Yooks and the Zooks live on opposite sides of a long curving wall, with the Yooks dressed in blue and the Zooks dressed in orange. They can't get along because the Yooks eat their bread with the butter-side up, while the Zooks eat it with the butter-side down. Can't we all just get along?

Asked by Tom Cohen · Last updated 5 years ago · 861 views