Here is a simple tip that will help improve your bird photos no matter what type of camera you are using.
Photography is essentially the capture of light. The way light strikes your subject makes a significant difference to the quality of your photo. How can you use this fact to get a better shot? Pay attention to where the sun is when you are shooting. Ideally the sun should be directly behind you when you photograph a bird. I know, this is the reverse from taking photos of people outdoors: if the sun is behind the photographer, every person in your photo is squinting because the sun is shining right into their eyes when they look towards you. But birds don’t typically squint, and by placing yourself with the sun behind you this will achieve the best possible lighting and minimize shadows. How can you judge quickly where the sun is? Look at your shadow, if your shadow is pointing towards the bird, this is ideal.