As useful and attractive as sheet glass and plastic are in human buildings, the windows they make are indiscriminately lethal and devastating to free-flying birds. This book describes the cause and breadth of this universal problem and how to solve it. Detailed objective observations and experiments reveal that birds behave as if clear and reflective windows are invisible to them. Alarmingly, among the dead are the fittest individuals in species populations. Science has documented that a decline of a third of the annual North American bird population, approximately 3 billion individuals, has occurred since 1970, and one of the principal mortality sources is windows. However agreeable and possible, citizens the world over are asked to take action and join in making the human built environment safe for bird life as one of Nature’s most beautiful, useful, and spiritually uplifting creations of planet Earth. Unlike the complexities of other environmental challenges, such as climate change, this important conservation issue for birds and people can be solved, and the means to do so are described within the pages of this work to guide this worthy effort. The author's 44 years of scientific research have revealed answers to create proven bird-safe products for sale. This book ultimately tries to make the case that such a commitment is worthwhile and needed.