Love this. Did it only run in '66? Because I recall seeing it on TV at some point, and I was born in '84.
You know, it looked familiar to me too and I wasn't around in '66 either so maybe they kept it around.
One interesting thing about this is that color TV was still pretty new in 1966, so this ad uses the color very carefully. It would still look good an clear in black and white, but if you did have color then you'd see the birds all bright and cheery.