Blue jays are such beautiful birds, but they can be extremely aggressive. I used to put seeds outside of my apartment window and I had ran out for a couple of days. I had a squirrel and a blue jay apparently trying to tell me that they were mad with me for not feeding them for a couple of days. The squirrel was climbing up the screen, chattering at me and the blue jay was hopping around and flapping his wings in an aggressive manner. They seemed relieved once some seeds were put out there.
My Daughter and Son-In-Law have had Doves being born in one of their plants in their patio in the past. The last eggs, a Blue Jay ate the egg while mom and dad had left the nest unattended:( My daughter found one egg on the floor:( Baby doves had been born in the same plant twice. They were so cute.