In this cartoon Dr. Seuss is showing that even though Germany may not have much food for all of its people, they can "eat" or take over other countries. This is how Hitler came to power, he promised the people of Germany that he would solve their problems of starvation.
This cartoon is talking about how Hitler brainwashed all the Germans to make sure that they didn’t realize what they were doing to the Jews. The hats that they are being given are ostriches, this shows that the people of Germany need to just stick their heads in the ground and block it all out.