Posted: 17/06/2013 at 09:42
Have a google for a water scarecrow. It attaches to an outside tap and has a sensor so any passing cat triggers a wpray of water. they hate getting wet and go away. You just need to move the sensor regularly so they don't work it out.
I have always had cats and birds. The trick is to hang peanut feeders and fat balls out of cat pouncing range and to put ground feed down where there is no shrub or fence for cats to hide and pounce from. Having shrubs for the small birds to hide in also helps in case a sparrow hawk comes hunting.
Works here. In the last 10 years I've had no small birds caught by my cats, no matter how they try.