I like this book a lot. We learn about many different habitats in first grade (desert, rain forest, caves, ocean, etc.). One week we read fictional stories about hermit crabs and non-fiction books about many kinds of animals that live in shells. In our science station they get to look at a tub of shells with magnifying glasses and try to find the names of those shells by looking at several books aboout shells. One of my favorites is "The Shell Book" by Barbara Hirsch Lember because it has such beautiful illustrations. My students never want me to take these things out of the science station after this "unit" - so I don't. Long after we learn about this habitat, they are sorting and classifying those shells. In fact, last week, two of my students asked me to come to the station to go through the "Shell Museum" they had created.
In addition to learning about the animals that live in shells, we also learn how to use descriptive words to make our writing more interesting. Using words like smooth, rough, shiny, colorful, fancy, and plain to describe our shells helps us write and speak using more adjectives.