Empids
"Empids" as we like to call them are definitely one of the most challenging groups to ID and the reality is that some individuals are just not going to be identifiable, especially if they're not vocalizing. Of the four in your area, Cordilleran is the most distinctive - it's much more greenish/yellow overall with a large bill. Hammond's has longer wings than the others and Gray has no green/yellow on the head and back whereas Hammond's and Dusky typically do show some. Hope that is helpful!
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