This is no doubt one reason for the blue jay's disdain for owls in particular. Owls are known to pluck jays from nests during the night. When jays spot an owl roosting during the daytime, they will dive bomb and peck it until the owl is forced to find a new roost. Fellow Corvidae family members behave similarly around owls. Crows are also known for their owl attacks.
Blue jays are among our most beautiful and intelligent back yard visitors.
Watch them and learn just how smart a bird can be.