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.
With millions of birds everywhere, finding birds is thankfully, pretty easy. Here is a list of some of my personal favorite places to watch/photograph birds.
Why all this fuss about blackbirds?
Because no other bird has a song written about them by the Beatles. Paul McCartney has given differing, contradictory statements regarding both his inspiration for the song and its meaning. In one of these scenarios, he has said he was inspired by hearing the call of a blackbird one morning when the Beatles were studying Transcendental Meditation in Rishikesh, India.
It's old and you may have heard about it, but THE BIG YEAR is probably the best thing to happen to birding since binoculars.