As the human population skyrockets and the toxic impact of human society spreads, the natural habitats of birds degrade and diminish and the bird populations decline. Two hundred years ago, when the United States and Canada were home to less than 5 million people, they were also home to some 650 species of birds. Today, more than 280 million people live there, and 33 bird species have already been driven to extinction and well over 150 are in danger of extinction in all or parts of their range. This book, organized and written by the authors of The Birder's Handbook, and enriched by 191 colour paintings illustrating all of the birds treated, is a concise review of the status of the birds currently imperiled in the United States and Canada - those that are federally listed as endangered or threatened and those that are listed by the National Audubon Society as suffering local or regional or widespread decline. It also treats the birds that have been driven to extinction in the past two centuries, since the stories of their somber fates can help us learn how to save the other birds that are in jeopardy.