You put out a bird feeder and attract as many cats as birds. What to do? back off and let nature have it's way or fight it? There are enough snakes and 'coons here too,to give the birds a really hard way to go, but eventually you see the young ones show up for a meal.
But, the cats and snakes keep the rats more or less under control. I just watch and let them go. Except I grease the bird feeder pole. The squirrels hit it about 18 inches off the ground and slide back down like a fireman. There is plenty knocked on the ground for the squirrels, but Iguess they like to sort through it.