Did you know that crows hold grudges? And that geese work as security guards? Discover the wild, sometimes strange world of birds! In this book, readers in grades 4-8 will learn about birds and their mighty brains, their breeding habits, and how they help humans.This series introduces young readers to some curious, cute, and downright strange facts about plants and animals. These high-interest books feature stand-alone spreads, so readers can flip pages and read in any order. Glossary words are defined on the page where they appear, boosting reader comprehension.