Probable but not certain - reporting in case someone else sees it more conclusively. A large black bird flew from the bridge over the marsh angling northwest away from my position. Kneejerk reaction was cormorant but immediiately realized it was the wrong shape and flight style - but too big for a crow. I got my binocs on it in time to see the big head and thick bill and realized it was very likely a Raven. Tried for photos but by then the distance was too great for a definitive image. I'm reasonably ceeetain that this was a Raven but sans documentation won't report it to Mass Records.