Most furry creatures won't touch it, but the cardinals and many other birds love it. Yes, this may limit the species you attract...but for me it's worth the tradeoffs.
I am on a mission...good tips here...there is one (at least) brazen little furry bastage that has chewed up a bunch of cedar shingles near the vent at the peak trying to get in the house....pisses me off cuz now I'll have to replace the shingles after the war..and the new ones will never match....
all squirrels must die