Here are a few recent shots for your consideration. Please share your comments and suggestions.
The Red Shouldered Hawak was taken with a Nikon D200 and Sigma 50-500mm lens @ 500mm, ISO 800, I think and f/18 aperture priority, which produced something like 1/1250. The Jack Rabbit was a Nikon D40x and 70-210mm VR lens with a Tamron 1.4x teleconverter, also @ f/8, I think. The Flycatcher the same, and the Magnificent Frigatebird was a Nikon D40x and Tokina 100-300mm lens.