Its funny what some of you wrote about blue jays. When I was a kid my dad and hunting partners always said when the blue jays start squawking pay attention because they squawk at bucks.
Honestly, in almost 40 years of hunting and lots of it, I've never seen a blue jay squawking at a deer. Never, not once. I always think of that when I hear them andthey always seem to be just squawking at each other.

Dab