This series explores a broad cross-section of the animal kingdom, introducing readers to notable species from around the world. Each title covers one major grouping of animals, including amphibians, birds, fish, invertebrates, mammals, and reptiles. Readers will learn what makes these animals unique and discover how each species fits into the overall picture of life on Earth. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.