nice and sharp.
Where ever possible you need to be able to shoot from a less steep angle to get the best bird shots.
Dont be afraid to use your flash also to remove the shadow areas on the bird. this can also bring out the highlights in the plumage.
You could also try for a less busy background.
The sweetest shots seem to be taken during early morning and late arvos.
The best shots also have the light behind the camera.
Having said all of that, birds arent easy to photograph. They have a tendency to just fly away.
I have been spending months studying the bird photography techniques of the experts.
It is hard, but also something completely different for me, thats why I am enjoying it.
You should have a look at the bird forums on
http://www.naturescapes.net
and see what the pros are turning out. This can help an awful lot.
Steve