Have you ever seen a large white duck at a pond?
White ducks can show up in the wild, but they are rare. It is most likely a Pekin duck.
If the white duck actively approaches people and seems friendly it is even more likely to be a Pekin.
PEKIN DUCKS ARE NOT WILD ANIMALS! THEY NEED HUMANS TO SURVIVE!
Pekin ducks are domesticated and do not exist in the wild. Pekin ducks do not have the ability to fly, but more importantly: Pekin ducks do not have wild instincts!
If you see a 'wild' white duck it is most likely an abandoned pet. People impulsively buy ducklings, not realizing that it is very hard work to keep pet ducks. People who no longer want the ducks will often abandon them at ponds, unknowingly leaving the poor animals to die.
Even worse, some people buy ducklings with plans to abandon them later. These people usually use ducklings for 'cute videos' in order to get likes.
If you see a channel with a bunch of cute duckling videos and no follow up on the duck's growth, as if the duckling vanished overnight, DO NOT GIVE THEM LIKES
Abandoned adult ducks often last, at best, a few months in the wild. Ducklings only last a few hours.
It breaks my heart to know that people do this.
Do your research before getting a pet.