skyrocketing avian murder rate Tweety killers some cats Various reports 3.7 billion birds a year some USA Today some 3.7 billion Cats, unfortunately, are also an invasive species massive toll on our native wildlife Your feline pets are killing 3.7 billion birds annually. Cats, unfortunately, are also an invasive species Domestic Cats Estimated at 3.7 million. Domestic Cats USA Today's Your feline pets are killing 3.7 billion birds annually. some USAtoday ecological impact of outdoor cats USA Today USA Today Roaming cats kill up to 3.7B birds annually Your feline pets are killing 3.7 billion birds annually. Pet cats kill even more. Roaming cats kill up to 3.7B birds annually some Roaming cats kill up to 3.7B birds annually USATODAY source Roaming cats kill up to 3.7B birds annually Domestic Cats site américain Your feline pets are killing 3.7 billion birds annually. Your feline pets are killing 3.7 billion birds annually. Estimated at 3.7 million. some Your feline pets are killing 3.7 billion birds annually. some USATODAY source massive toll on our native wildlife http://www.usatoday.com... USA Today 3.7 billion birds per year in the US alone cats particularly