15. Extinct Species
In addition to many new species of birds being diminished recently, there are many types of fowl that have been rendered extinct. Whether by natural selection or human interference, nearly 40 species of avians have been eliminated in North America. Unfortunately, it seems like, with the way things are going, even more, bird species will be wiped out in the future.
Many of the bird species that are now extinct roamed the Earth millions of years ago. They most likely survived the great Ice Age and were eventually hunted by the early humans. It’s fascinating to think about all of the first birds that were the genetic basis of the modern birds we have now.