Banana01
Songster
I thought it was a gimmick too, but there are quite a lot of articles about people successfully using capascin to deter squirrels. Its easy enough to try it in different forms (red pepper powder, haberno water, etc). The chickens and birds supposedly dont care.I've seen hungry squirrels denude a hot pepper plant. Doubt you could put enough cayenne in the bird feed in dried form to deter them. Thai (birdseye) chilis are much hotter, but I wear goggles and gloves to deal with those - too much hassle.
The squirrels will either go find a new food source closer, or will be hungry enough to suffer.