Blue Jays are smart bird even though they don’t have great voice (but they can imitate other birds singing pretty well especially they imitate hawks very well and I often fooled by them.) And Blue Jay often helps each other especially when one of them is attacked by a cat or a hawk. They start gathering around attacker with their noisy voices and start chasing the attacker for a while.
By the way do you know they like dog food very much as you can see on these pictures. If the size of dog food is small enough for them, you don’t need to do anything for serving them. But if the size is too big for them, you need to swollen dog food with water before serving to them.