i love to take pictures of birds..it is simple..i try not to get too close, even the slightest movements at times will start the birds, footsteps, and even the reflection of the bird in the lens even if i am at what i think is a half decent distance (i'm using a 500 mm telephoto as well) so i know i don't need to get too close.
there were times in high park i wanted to scream at the tourist/camera group taking pictures of the wood ducks, and litterally whipping some form of seeds at them, and then realized these people didn't even speak english
i was not impressed.
if a bird crosses my path as i am walking about, i will try to take a picture. if the bird flies away, i am greatful that i got to see them and move on.
i always try to approach with caution, even if it is a bird i do not want to photograph, it may be eating or feeding its young, i slow my pace and try to make sure the bird doesnt feel threatened, but sometimes no matter what you do..they do fly off.
i also remember appologizing profusely to a lovely gent in a park that was trying to get a picture of a bird, and i was happily "romping" down the hill unaware and frightened "his" birds away.
stuff happens and i felt bad, but sometimes we have no way of knowing. now when i go to that park, i check from a distance to make sure i don't encroach upon his work.
there is nothing more satisfying then getting that "perfect pic", but also remember that you can shoot from a little distance and always crop your photo in photoshop or whatever editor you use to make the bird look closer.
just my two cents.
Irene
God gave birds wings so they could fly away when they feel in danger.