During my Dr. Seuss unit I like to mix in non-fiction. Kind of like blending up spinach into the mac-n-cheese! Yertle the Turtle as a character is Seuss' representation of Adolf Hitler. I use an online biography to read aloud with students and answer questions after. The questions encourage students to provide evidence and answer text-based questions, all while knowing they get to read a Seuss story after! Cheers!