Rex checking out the smells under the feeder.
Hubby had the answer to this problem; he remembered he had such a thing as protectors for bird feeders up in the barn loft. This large metal roof you can make out in the photo atop the feeder has worked like a charm. Mr. and Mrs. Chipmunk can't get directly at the feeder and are back to scavenging on the ground like they always did and the seeds are saved for the birds. Just so they wouldn't feel too badly, I've been putting a few more peanuts under the tree for them which they love.