I've tried many times to get a reaction (other than hidding) from a squirrel to a call. I've got one of those small metal discs, that makes a distress call when you pull air through it,a wooden block and striker used to mimic barks and also a bellows call that makes barks. I've tried these calls when a squirrel is moving away from me and when no squirrels can been seen. I've tried them in various situations and have never seen a benefit. I don't know if I'm using them wrong or squirrels just don't respond to calling. Anyone had any luck? If not, I may as well taken them out of field bag.