I was moored next to some one who fed the local wild fowl with dried cat food, and needed a trolley to cart the huge sacks to his boat ( I kid you not).
He would talk to them in baby talk but thrash the water with an old fishing rod to deter the ones he thought were getting to much, I used to leap out of my chair thinking some ones fallen in !
I did try talking to him whether dried cat food was a good diet for swans etc and the shear quantity , several double hands full several times a day, was a good idea ?
I also tried to explain the sense in maybe creating a dependency on this free hand out and it was sad to watch the cygnets get chased away from the feeding session by the Cob when they were approaching adult hood with little experience on feeding them selves.
I still wonder if they survived their 1st winter.
I guess it's possible to kill with kindness......