I read this article with interest being a backyard bird feeder myself (and yes my feeders have multiplied and increased in size). I was however dismayed again to read the last part of the article where cats are again blamed. It is always disheartening when people claim that cats kill 'billions' of birds. I seriously doubt that if they are killing birds at that rate, that we'd have any birds left.
I did however find this interesting website from the comments section.
There was also a great article in today's Straits Times about the macaques. Substitute the word 'cat' for macaque and you wouldn't be far off.