You must keep moving, and the action must be very smooth, not jerky. You must set your feet apart for steadiness. When you feel you've achieved a smooth action, try clicking off a shot or two when the subject is even with you, but keep your panning motion going even after you've snapped the shot. The idea is like a follow-through in hitting a golf ball or kicking a football. Finally, wide-angle, telephoto, and zoom lenses are very nice and can increase your capabilities, but they aren't necessary for you to capture beautiful photographs, as the wildlife officer's daughter proved.
Nothing beats a good eye and taking the time to do it right.
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