Jays are larger, and have more white and gray coloration, and have a crest. They are in the family Corvidae, with crows and ravens. The bluebirds are a deeper blue, and are thrushes, family Turdidae.
BBs cn get rid of them but if you don't want to hurt them.. *_* maybe some large wind chimes? I took care of my problem Blue Jays with a CD. The same people that make Crow be Gone have a CD to deal...