Godwits in our fields

Ray reported a flock of Godwits in a field yesterday. Needless to say, there is a brand new slough or seven in the same field.  We drove over there today (in the midst of our farming duties) and noticed that one of the godwits was smaller than the others and darker.  When it flew, there was a very obvious white patch on the rump.  A quick glance in the guide book suggests this bird just may be a Hudsonian Godwit.