Students are introduced to a fictional problem (the need for a new hamster habitat in a pet store) and are invited to solve the problem through an engineering design (a hamster habitat). They work through a series of lessons to learn about the needs of animals and how their habitats provide their basic needs. Students research a variety of animals and habitats in the wild and in captivity. At the end of the unit, students use what they have learned to design and construct a habitat prototype that meets all the basic needs of a hamster and the criteria of the client (pet store).