Slow shutter speed combined with panning the camera can achieve a motion blur for moving objects. This technique is predominantly used in shooting automobiles, birds and wildlife. Personally, I love shooting birds in this mode.
In this case, I shot this black necked stork in flight at Kaziranga National Park in Assam, North East India. The black and white colours of the crane contrast beautifully with the green forest background. I could have zoomed into the bird, but thought that the bird would look amazing against the forest background in this blur mode.
In fact, I think the entire blurry picture looks like a oil painting. I would have been even happier if the focus on the bird was even sharper. But, it looks great otherwise too. What do you think of the blur? Have you taken such kind of pictures before? Any suggestions or best practices that you would like to share?