http://www.nytimes.com/2011/03/21/science/21birds.html?_r=0

Tweety Was Right: Cats Are a Bird’s No. 1 Enemy

“I hope we can now stop minimizing and trivializing the impacts that outdoor cats have on the environment and start addressing the serious problem of cat predation,” said Darin Schroeder, the group’s vice president for conservation advocacy.