What's your favorite animal? In My Favorite Animal: Koalas, students will learn amazing facts about koalas. Each My Favorite Animal book features interesting non-fiction at a 2nd-grade reading level paired with questions throughout the text to check the reader's comprehension. Sample Text: Koalas are solitary animals. They are mostly active at night and spend most of their time eating and sleeping. Koalas are also territorial animals. They find an area that has trees that provide food and shelter. They mark their territory by making scratch marks on trees.