Bird Photography on a Budget
The equipment for bird photography can be very expensive. Part of this is the nature of the business, photographing small moving objects requires long telephoto lenses and effective autofocus systems
Beginning bird photographers would be well served with a good cropped sensor camera body and 400 mm f/5.6 lens or a 300 mm f/4 lens with a 1.4x teleconverter. By applying several common sense strategies you can acquire such a system at a reduced cost.