One of the great assets of North America is the richness of its biodiversity. Because of their familiarity to us and the many recognized services that they perform in our environment, birds are emblematic of this rich diversity. North America is home to nearly 20 percent of the world’s bird species. More than 1,100 species are found in Mexico, 700 in the United States and 575 in Canada. Hundreds of these species are shared among all three countries, and many are only found in North America. Several hundreds of these bird species are designated as vulnerable and the populations of many others are declining.