When trying to find Shmuel's father, Bruno and Shmuel get caught up in a large group of Jews, and are lead to the gas chamber, and are killed by poison gas. (Zyklon B) :(WARNING: This is really...
With Yertle the king turtle, now being king of the mud for that's all he can see, and Mack, the turtle at the bottom of the stack, taking Yertle's rock throne, and king of the pond.