I saw two in a northbound flock of sandhills north of Bismarck the other day. Have actually seen whoopers quite a few times over the years while bird hunting northeast of Wilton. First time I saw some, my Dad took me a block north of Bismarck's Grimsrud School to see about 20 in the field south of I-94...that was in the mid 1960's...I remember him telling me about 50-60 of them existed at that time, and that most people will never see one in their lifetime...have been in to birdwatching ever since.