Photographing wild birds is a challenging activity. It offers even more obstacles than other nature photography: not only can the birds fly away once you have taken the perfect photo, but they are often hidden by branches, twigs and foliage, or silhouetted against a clear sky. But the challenge is part of the fun, and when you get that one magical photo of the 400 you've taken, it's all worth it.
The tips here are not for professional nature photographers who use equipment that easily costs north of 1
Just as important as one of the tips below is that you know that successful bird photography requires patience and dedication. You often go on a bird walk and have nothing to show. On other days you come home and notice that you have pictures of new bird species that you didn't even realize you saw while you were there! For those of us who don't have direct identification, having photos is a big help in putting together your list for the outing (and sending it to Cornell Lab from the wonderful eBird site of Ornithology.)
If you have better tips for yourself avian digital photography, don't hesitate to post them in the comments below.