In this FACTivity, you will answer the question: How does the energy use involved in the construction of three homemade bird baths compare when they are constructed? Materials: 12″ clay pot 12″ clay saucer 12″ plastic pot 12″ plastic saucer Metal trash can lid Large, sturdy plastic bucket Acrylic sealant (spray can or brush-on) Paint brush Outdoor glue 24″ rope Two bricks Flat rock about 4″ in diameter Topics: Engineering and Forest Products, Class Discussion, Group Activity, Hands-on, Outdoor Activity.