Oh, these are fun! What pleasant looking chaps - always smiling.
The only one that really doesn't seem to do anything for me is #2 but I don't know what in the world I'm saying. I only think that it's because, I really can't see his face. Also, Ken, there seems to be a lot of noise. Were they moving fast and you had to "up" the ISO? Also, (and bear in mind, one cup of coffee has done absolutely nothing for me, this morning) It might be nice, if possible, to have different compositions, instead of close up crops. Would their personalities still come through if you had a few landscape shots - the bird looking into more space within the frame. Maybe, though, you were cropping out something that you didn't want to be seen. Anyhoo, space in composition - negative space being just as powerful as positive, is something that I've been thinking about for a month or two (Donald is responsible for part of that - it's all a part of his photos.) Enough!
What I'm really doing is stalling, trying to think of a word that really hasn't come to me, yet. The birds look like they have human personalities - thinking silly human thoughts - really fun and funny!
Oh, and, Mr. Ucci, Sir, congratulations on having the opportunity to satisfy some of your lens lust!