A notebook is perhaps the single most important piece of equipment a naturalist takes into the field. But notebooks are not only for use by field scientists: They are also excellent tools for helping students record observations outdoors, develop communication skills, and mirror the work of real scientists. They may contain observations and drawings of plants, animals, and their habitats; tallies, tables, and graphs; ideas and inferences; scientific questions and thoughtful “wonderings”; narratives and reflections; and even poetry. The activities in this chapter offer some engaging ways for students to use notebooks to record both what they observe and what they think about nature.