Marine mammals play a vital role in the health of the oceans, but they are facing global threats—most caused by humans. Whale populations are declining, dolphins are under attack, and seals battle environmental forces. Countries around the world, however, are banding together to try to help these important animals. Inside, meet these unique and amazing creatures and read about ways everyone can help them survive. Humans share the planet with billions of animals. In recent decades, however, humans have been causing a lot of those animals real problems. We have been destroying their homes and hurting the environment they live in. Fortunately, conservation experts are fighting back against these dangers. This series highlights the issues and possible solutions as we all focus on PROTECTING THE EARTH'S ANIMALS. Key Icons appear throughout the books in this series in an effort to encourage library readers to build knowledge, gain awareness, explore possibilities, and expand their viewpoints through our content rich nonfiction books. Words to Understand shown at the front of each chapter with definitions. These words are set in boldfaced color type in that chapter, so that readers are able to reference back to the definitions, building their vocabulary and enhancing their reading comprehension. Sidebars are highlighted graphics with content-rich material within that allows readers to build knowledge and broaden their perspectives by weaving together additional information to provide realistic and holistic perspectives. Text-Dependent Questions are placed at the end of each chapter referring back to subjects covered within. They challenge the reader's comprehension of the material they have just read, while sending the reader back to the text for more careful attention to the evidence presented there. Research Projects are provided at the end of each chapter as well and give readers suggestions for projects that encourage deeper research and analysis. Educational Videos are offered in chapters through the use of a QR code, that, when scanned, takes the student to an online video showing a moment in history, a speech, or an instructional video. This gives the readers additional content to supplement the text. A Series Glossary of Key Terms is included in the back matter containing terminology used throughout the series. Words found here broaden the reader's knowledge and understanding of terms used in this field.