Change the tune of song birds

http://www.biologynews.net/archives/2011/05/26/songbirds_tweak_their_songs_in_in_different_ways_to_cope_with_clamor.html

Birds rely on their songs to communicate and find mates. We made the world today a noisy place with driving and construction. We are drowning out their music making them more prone to attack and preventing them from communicating. Two species of vireo in New Mexico, the grey and plumbeous. To go above the blaring 85-100 decibel world the grey vireo raises the pitch of the highest part of song. On the other case the plumbeous vireo raises the pitch of the lowest part. These may affect however environments with numerous bird species

Some people think that a birds song can't change because thats what they sing constantly. But the birds need to cope with the environment around them in order for them to flourish. Whose to say that there are thousands of birds out there that do this.The more we continue our manifest where we believe were superior the more we will damage the world. If we limit the amount of birds in the world whats next.