Guys, I'm a big believer in listening to the blue jays. In my neck of the woods, they are the tattletales. Almost every deer I see, I can hear the blue jays screaming before I see the deer. Happened first day here. I could hear them screaming in the apple orchard and within minutes a doe and a button buck walked out of there.

With the squirrels, I haven't so much noticed the bark, but more when they move quickly out of an area. I always look back to where they came from and a lot of time will see a deer or fo or something moving thru.