http://www.washingtonpost.com/national/health-science/outdoor-cats-kill-between-14-billion-and-37-billion-birds-a-year-study-says/2013/01/31/2504f744-6bbe-11e2-

http://www.washingtonpost.com/national/health-science/outdoor-cats-kill-between-14-billion-and-37-billion-birds-a-year-study-says/2013/01/31/2504f744-6bbe-11e2-ada0-5ca5fa7ebe79_story.html http://www.washingtonpost.com/national/health-science/outdoo... I doubt that those are all frail and doomed to an early death.