This unit provides students with an opportunity to study ecological relationships with an emphasis on the Sonoran Desert. Students appreciate the complexity and balance that supports the exchange of energy and matter within food webs. Species adaptations are examined. Students then apply these natural relationships to the study of biomimicry and sustainable design. They study the flight patterns of birds and relate their functional design to aeronautical engineering. They are presented with a Challenge Question in which they must design a sustainable guest village within the Saguaro National Park. The solution rests within the lessons and applications of this unit.