I have three blue jays (two fledged here) in yard and they really keep the little birds alerted. I heard the blue jay, then saw the Cooper's hawk land on the patio, then went to the fence. All birds had scattered.  The blue jay is gorgeous, a little on the dominant side, but a very good watch bird.

Jane Allen
St. Louis County
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The Audubon Society of Missouri's Wild Bird Discussion Forum
ASM Fall Meeting: September 24-26 at Camp Clover Point