Many biology educators at the undergraduate level are revamping their laboratory curricula to incorporate inquiry-based research experiences so that students can directly participate in the process of science and improve their scientific reasoning skills. Slugs are an ideal organism for use in such a student-directed, hypothesis-driven experience. Slugs are inexpensive, easily collected, and low maintenance. Most students are unfamiliar with slugs, and their curiosity is piqued as they observe and classify these fascinating creatures. The procedures described here offer step-by-step instructions on how slugs are used to guide students through an inquiry-based research project for 7 weeks in a majors general biology course.