I agree with the others; some of these are pretty nice!
#1. As mentioned by others, a crop would help this one--I did this one just as an example. I also adjusted the curves very slightly--I don't see that the sky really NEEDS much in the way of "toning down."
I did also clone out the tiny bit of log and the brightly lit weed to the right of it--that's the area circled in red in my version.
(Sorry, this is a quick job on a jpeg, just to give some idea!)
2. LOVE this shot! Very nice perspective on it and good focus. Like Jaca, the first thing that grabbed me was the OOF foreground. I'd crop to eliminate that.
3 and 4. I'd bin these. Not that they are BAD, but they are "misses." And with birds, you have to just accept that you're going to have a lot of "almost" shots and be willing to bin the ones that don't make it. Generally, when the bird is flying OUT of the right side of the frame, it's a miss. #3 is closer but I'd still bin it; a second or two earlier and the bird would have been facing the camera just perfectly--but again, I know, you can't always get the focus and actuate the shutter at the precise right time with these guys! Another thing to watch in #3 is that you've got the bird almost dead center in the frame; if I were going to keep this, I'd at least crop it so the bird was closer to the third line on the left side of the photo.
5. This one is also quite nice. You've got an interesting "pose" and good focus. I'd crop it so the bird is in the upper right portion of the frame.
When I shoot birds, I basically try to treat them like portrait photography in a lot of ways--especially portrait photography with kids, where you can't give them a lot of direction. Watch for good poses, interesting action, "emotion" from the birds. Look around at your overall scene when you first arrive, so you have an idea of what to try to get in the composition and what to try to avoid (there's several places I go where if I shoot one direction, I get birds over water; if I shoot another direction, I get birds with cars in the background, and another direction lends to birds with a giant stone building in the background).
Also, pay attention to the birds you want to get photos of. Spend a while just watching them. You'll start to learn their behavior and be better able to anticipate what they are ABOUT to do, and therefore better able to capture those critical moments of action, instead of constantly trying to "react" to a pose or action shot and missing it by 1/1000 second.