This chapter focuses on how engineers help animals. After some time to brainstorm together, students come up with an idea that engineers may help veterinarians heal sick animals or zookeepers develop safe habitats. An engineering design challenge is proposed for the students to design a model prosthetic trunk for a rescued elephant. The Nature of Science and Engineering unit described sets the stage for a year of learning to collaborate and communicate with a diverse team using the engineering design process. It aligns with a coherent K–5 engineering curriculum that balances knowledge and practice. A materials list, teacher background information, and outcomes are provided. This book selection includes the Table of Contents, Introduction, References, Internet Resources, and Index.