What's your favorite animal? In My Favorite Animal: Rays, students will learn amazing facts about rays like Manta Rays and Stingrays. 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: Rays swim very differently than other fish. They flap their pectoral fins up and down which makes them look like they are flying through the water like a bird. Some rays can even jump out of the water.