My wife gets great pleasure out of watching her bird feeders that are just outside the window [View all]
from where we spend the most of a typical day. She buys Black Oil Sunflower seeds by the 40 pound bag. This year, we have a bumper crop of squirrels who love the seeds. I don't begrudge the squirrel's a meal, but they can eat Sunflower seeds at a rate that we can't afford to supply.
We have had the Yankee bird feeders for years and the squirrels have figured out a half dozen ways of defeating the feeders. Two of these feeders are mounted on a substantial steel pole. Yesterday, for kicks and giggles I greased the pole and the results were hilarious. (for about an hour) That is how long it took the rodents to figure out that they could climb an adjacent feeder and leap to the top of the Yankee feeders and use their old tricks to avoid the bird perch that triggers the spinning of the feeder. It is entertaining until all of the squirrels have had a go at it a few times. Anyone who doesn't believe that squirrels aren't clever is just not paying attention.
If you are not familiar with the Yankee feeders, do an online search, the ads are good for a giggle.