Because of it's close proximity to wildlife, it is especially important that the structure be built with sustainable materials. The concrete being used is glass fibre reinforced; it uses less cement than equivalent concrete and often uses significant quantities of recycled materials. The steel used in the framing contain at least 28 percent recycled steel and is completely recyclable. Glass can be recycled forever without any reduction in quality, and the energy needed to recycle glass is much less than that needed to manufacture new glass, thus making recycled class a good choice for the project.