Platypus Problems: When Ms. Diaz directs the class to wear costumes for Animal Awareness Day, Stanley is assigned a seemingly bizarre animal. He doesn't know how he's going to show his face in school wearing webbed feet, a beaver-like tail, and a duckbill. Stanley is down on his outfit, not even knowing what animal it's supposed to be. Dennis helps him to see that a little knowledge can change his mind about this unusual animal. Rabbit Habit: Mimi and Marci want a pet and get permission from their parents to have one. They're not certain, however, what type of pet they want, only having a set of guidelines from their parents to go by. They, Stanley and Dennis have a look in The Great Big Book of Everything to determine the perfect pet.