I have had it up for about 10 days, so far the squirrels have not had any success in getting any seeds but they have not given up trying. The smaller birds, Sparrows, Chickadees etc. are able to get inside and feast but the larger Cardinals, Woodpeckers and the like I have not even seen since placing this feeder. I hope that eventually they will return but they may not be able or willing to feed in this type of caged hopper.