there are many kinds of ducks at Crystal Springs, so many that they have as sign board with drawings and descriptions of each kind.
They are not the least bit concerned with us either, we would be walking down the path and encounter ducks taking naps right there in the middle of the walk path! We just stepped around them and they seemed very unconcerned.
If they were on the water, they came swimming up to shore to see if you had anything for them. Clearly, the ducks have it good here.