Dona Herweck Rice 
Showdown: The Fight for Space [PDF ebook] 

Competition is natural among species. Some species get stronger, while others fall away. With TIME For Kids content, this nonfiction book teaches students about competition among species. This high-interest book will engage students in reading as they build their comprehension, vocabulary, and literacy skills. The Reader’s Guide and culminating activity direct students back to the text as they develop their higher-order thinking skills. Check It Out! provides resources for additional reading and learning. With text features such as a glossary, index, and table of contents, this book aligns with national and state standards and will keep students engaged in reading.