A commonly dissected invertebrate, the crayfish is shown in 3-D so learners can study the organs and structure of an animal with an exoskeleton. Colorful model illustrates the special adaptations the crayfish has for life under water with an inset of the gill structure. Activity notebook with glossary, key, blackline master, and color transparency. For grades 5-12 and ages 10-18 years. Measures 24" width by 18" height.