As an equine veterinarian, I sometimes did still photography to help diagnose lameness problems.
But, Doc, why didn’t you use video since the problem was one of movement, you ask.
The bald eagle shown here, the wing beat captured in 2 cycles, is the reason for the stills …
I can see the stretch of the body and the pull of the wings on this healthy eagle.
In a video I would have to stop the movie, hoping to catch the moment of a problem.
With the stills I could more easily see the changes in a horse’s gait.
Or, if this eagle were in flight trouble, I could better see where in the cycle the problem occurred.