ducks, geese

Fluffy feathered pals by the university lakeside.
While having breakfast in the campus, I spotted these ducks and geese waddling and quacking. I only am familiar with ducks but I am not quite sure what the others are called, especially the ones with black/brown colored wings.
It was my first time to be up close and personal with these fluffy pals and it was nice to see how they were lining up and following their leader.