Today during the Hydrology Field Trip to various USGS piezometers on the Island, I noticed some exquisite Hawks flying above. At first we encountered several Red-Tailed Hawks. Later on over a marshy area, I saw a bird with a defined white rump hovering on an updraft. Later on I identified it as a female Northern Harrier Hawk also known as the Marsh Hawk.
Just wanted to post a picture of each Hawk and suggest that while walking around Nantucket: keep binoculars near, and look up!