Swimming birds and waterfowls

The trouble with biology is that everybody's knowledge is often incomplete. Is this a waterfowl? 

Lesser Whistling Duck

Yes, due to it having the correct family.

But if you mean if the bird can swim, this a night heron juvenile and it can also swim. 

Night Heron (Juvenile)

As you can see, its butt is above the water so it is not waddling in the water. 

And no webbed feet. 

And as you can see the webbed feet are not a hindrance to perching on branches. This a different duck.