The top two pics show a beautiful Canadian Goose with a much whiter head than normal, the white area extending across the bill.  Would this be like a birth defect or more like a birth mark?? If this goose produces goslings, I'd love to see what they look like when they mature.  We'll know soon enough.  Can't wait to see!
In the third pic one of the geese is yelling at the other one.  It's a long, low sounding honk and the body language is unmistakable. As it's honking it sticks it's neck out straight forward, low, almost parallel  to the surface of the water.
And the last pic is of a couple who've selected a prime housing/nesting location. They're guarding their property.  Every year a goose couple pick this spot.  She will make her nest between the stone wall and the fence that's next to a large tree.  When the female sits on her eggs in early spring and keeps her head low it's difficult to see her there.