Welcome to the community!
Beautiful shots and I have noticed by your camera settings you most probably took those photos in Aperture priority mode as the aperture is always f/5.6
With animals, and sometimes people, it is better to use Shutter priority of manual, animals are sometimes unpredictable, they move quickly, etc. 1/640 up to 1/4000 will help avoid the motion blur.
Have a great weekend!
RE: Ducks of the Zoo. [EN-ES]