We have three blue jays who regularly come to Carleen's kitchen window hopper-like feeder.
I can tell the three apart from the pattern of white in their primary wings.  "Mostly white" is
dominant, i.e., chases away, "Some white" and "Little white."  Some and Little seem to get
along just fine.
 
If one has the opportunity nearly all birds can be separated individually like this, at least on
the short term.
 
Good birding,  Larry H. 
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