This shot was taken on Grand Manan Island at the Anchorage Provincial Park Labor Day weekend.
With some help, I now believe this to be a Northern Harrier.
This is the same bird as the one perched in the first photo. I watched it fly (got this picture) and then got another one when it stopped on that tree. You can see the white rump so I believe it is a juvenile Northern Harrier.
In October a few years ago, I was in my backyard early in the morning and this Cooper's Hawk surprised me.
Thanks members of http://birdingnewbrunswick.ca/ for the help!