In order to take good bird photographs you are going to need to learn some basic bird watching skills. To get great photographs of birds you cannot scare the birds away! Here is a list of bird watching tips:
Be quiet. Birds have very good hearing, and are startled by loud or sudden noises. Try and keep any talking to a low murmur, but don’t whisper. Birds hear high-pitched noises like whispers better than they hear our normal voice.
Wear dull-colored clothes. Birds have excellent color vision. Wear dark blues, browns or greens to keep hidden.
Move slowly. Like people, bird's eyes are attracted to sudden movement. If you move slowly and steadily you are more likely to have good views of birds.
Use your eyes AND your ears. You will see a lot more if you listen for bird calls, or for birds moving in the bushes.
Don’t destroy the environment. You are just visiting, but it is the bird's home - don't mess with it!