All assets associated with the tag: North America
The journal 'Science' says that the population has shrunk by three billion over the past 50 years.
The skies are emptying out.
Carl Zimmer, New York Times
Bird populations in the United States and Canada have dropped by 29% since 1970, signifying 2.9 billion birds lost in almost 50 years, according to a new study.
By Ashley Strickland, CNN