I have used squirrels to my advantage, especially their bark. On more than one occasion a deer has spotted me, flagged and left the area. I wait a few seconds and then give out with a bark. After a few chatters, I just wait quietly. Three different occasions the deer (all three does) turned and continued on their previous trail, right past me. Two times I took them as they were the first deer of the season. The third I let walk as I was looking for a certain buck. A bark seems to calm a flushed deer into thinking that a squirrel caused them to take flight and they then resume their normal way.