Western Grebe (Aechmophorus occidentalis)
(He has an odd spot there between eye and bill.)
Similar to Clark's Grebe, but has black surrounding the eyes and a duller yellow or greenish bill.
Clark's Grebe is Uncommon in ND.
wiki Western Grebe
The Western Grebe has black around the eyes and a straight greenish-yellow bill whereas the Clark's Grebe has white around the eyes and an up-turned bright yellow bill.
wiki Clark's Grebe
Wiki has a list of birds for North Dakota.