Beautiful shots. That last one should get at least 9 style points for the backflip. I really like whatever you did for post processing these. Between that and the butter smooth bokeh, the birds really pop from the background.
Actually, I did very little post processing on these. I did these on my laptop since I didn't have power until last night. The birds pop from the background because of the lighting I used (see my previous hummer post). As for the smooth background...well, that's just the 600f4 working its magic ;-)