My favorite is the first photo because of the color and the dof. Just great colors on this, but I think some kind of crop (very slight) may help to get the bird a little more of center.
I not a big animal photo fan - so the others don't appeal to me a much...not that much interesting going on in those (one of the birds looks bored ;) ).
The last photo has the best composition of all of the but needs more color in the sky perhaps to make it a tad more interesting.
Hope this helps.
Cheers.