Using a telephoto lens will allow you to get up close and personal with your subjects while keeping your distance. You will be able to keep a low profile so you don’t startle them. In addition, birds are a mixture of incredible colours and textures, so you’ll want to be able to zoom in on their feathers, bill, talons, and eyes.
Using a versatile telephoto zoom lens, such as the AF-S NIKKOR 70-200mm f/2.8E FL ED VR, means that you can be more mobile, allowing you to follow your subject more easily. If you would like to photograph a close up shot of smaller sized birds, don’t be afraid to use something a little more heavy duty, like the AF-S NIKKOR 200-500mm f/5.6E ED VR.
There’s also no such thing as capturing too much detail in bird photography. Another bit of unorthodox advice, is to wear neutral colours. Birds pick up more colours as they have the ability to see UV light. Bright colours will draw attention to you, making it harder to stay hidden from your subject.