Animals and their offspring must defend themselves against danger from nature or enemies. From hard shells to camouflage, animals use their physical characteristics to help keep them safe. This nonfiction Beginning-to-Read book contains high-frequency words and content vocabulary. Connecting Concepts pages include a word list along with activities to strengthen early science and literacy skills, such as understanding nonfiction text, science in the real world, science and academic language, fluency, and finding further information. Aligns with Next Generation Science Standards for Grades K-3.