In this activity, learners are challenged to design, build and test a birdhouse that will stay cool in the sun. Learners investigate concepts such as energy efficiency, properties of light, and heating and cooling principles while they design, build, and test an energy-efficient roof for a birdhouse. Learners test several roofing materials under a heat lamp and record how much the heat rises over time. Using this information, they design a composite roof to achieve their design goal of keeping the birdhouse warm or cool, then test again to see if they have engineered a successful solution. There is also a related game -- Aviary Architect -- that you can play on your computer! The URL link for the game is included on the bottom of the page, under "Other".