Number observed: 1
Details: I observed a bird flying up the st croix river first thought was it is a Bonapartes Gull but the flight was different and it was alone usually not all the time I see Bonapartes in groups. The bird was fairly pale on the back and you could see some dark wedge on the underside of the wings as it flew it also appeared bigger then a Bonapartes but not much to compare it with. It has been a few years since I have observed them as they are rarer in Ontario. I have observed them in the past in MA, and PEI.