Friendship is another big theme. Mice in these stories often rely on their friends, whether they are other mice or different animals. In 'Mouse Guard', the guards depend on each other to protect their territory and solve problems. They form strong bonds that help them through difficult times.
One popular animorphic mice fantasy story is 'Redwall' by Brian Jacques. It features a world full of anthropomorphic mice and other animals, with epic battles, quests, and a richly detailed medieval - like setting.
Another element is the abnormal behavior or appearance of the mice. They might have glowing eyes, as if possessed by some evil force. This makes them seem more menacing and less like ordinary rodents. For instance, in a story I once read, the mice had fangs and would hiss like snakes, which added to the scariness factor.
Actually, 'Of Mice and Men' is not a novela. A novela typically has different characteristics and length compared to this work. 'Of Mice and Men' is considered a novella due to its concise structure and focused plot.