Hi there, I observed this bird in New Brunswick, Canada on June 14.
It started off when I heard the croak of a raven. I started in that direction and soon came across this bird, although it was not vocal while I observed it. I know size is sometimes difficult to judge in the field, but it didn't seem big enough to be a raven to me. The head shape seemed right, though, and it does seem to have the "shaggy throat."
What do you think?