Like most things - the answer to the question - "How Many Birds Are There In North America" is - it depends. If you are asking how many species there are - well the Americas have a rich and varied avifauna. The Continental United States is home to 1107 different species of birds, while Canada and Alaska host 686 and 521 species respectively. Despite being a smaller country, Mexico has almost as many birds as the US, with 1118 species recorded here. That amounts to 3,432 different species.