This title takes readers to musk ox habitats to understand why musk oxen are at risk, what humans are doing to make matters worse, and the ways humans can help to save musk oxen and ultimately, Earth. Sidebars, maps, and a glossary enhance readers' understanding of this topic. Additional features include a table of contents, an index, and a fact sheet. Aligned to Common Core Standards and correlated to state standards. Checkerboard Library is an imprint of Abdo Publishing, a division of ABDO.