Possible Rare Gull — pat morss

I took photos of some gulls a couple of days ago from the causeway at Brace Cove and consulted our daughter and husband who are experts in the field. They are fairly certain the first is of a Black-headed Gull, which is a rarity in our area. One was sighted in Newburyport in the early spring. Also attaching photos of some other gulls at the same location, including a Laughing Gull with a black head, and an ominous sky from home.