The charity’s original post about the duck’s injury attracted more than a million views in June.
Without treatment, the injury could have left the duck unable to feed itself or waterproof its feathers.
At the time, head of nursing Carla England said the duck had been fortunate to retain blood supply to the damaged section of its beak, which allowed surgeons to pin it back into place.
“It’s not a common injury but we have seen it before,” she said in June. “You can’t always save a beak that’s so badly damaged. It depends entirely on the blood supply.”