If anyone one is having problems with squirrels at birdfeeders - I have found away to control them from emptying a feeder in one day - I use bricks - I lay the bricks flat - one on each side of the feeder - this way the birds have enough room to fly in and grab seed but the squirrels don't - A smart squirrel can figure out how to get a few seeds but will eventually leave because the energy required to get the seed is more than the squirrel has to waste. A full feeder will now last almost a week.