Mixed up about a tablespoon of Dave's Insanity Sauce and Da Bomb Beyond Insanity sauce each with a quarter cup of water.
Poured a feeder filler scoop of bird feed into a ziplock, and put the horrible hot sauce mixture in there and tossed it around. Refilled the feeder.
Birds are unaffected by the hot stuff. Mammals are.
We'll see if this helps, even if just for this fill. Couldn't shoot any of them, because none came by.