What's your favorite animal? In My Favorite Animal: Elk, students will learn amazing facts about elk. 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: A male elk, called a bull, has antlers that can grow to four feet above its head. That would make the bull nine feet tall. Only bulls have antlers. Females, called cows, are smaller.