Tweet from Tripper Paul
@petersownbirds: Daisy and I are on one, and possibly a second BHGU on top of the treatment plant. Second one has only partial black hood.( Owls Head)
UPDATE: one of two Blackheaded Gull (BHGU) at the Owls Head sewage plant had a partial hood according to Tripper with an also present adult. Now this begs the question: are there three ? The Ikea Red hook BHGU seen by Dennis was an adult. The short span of time bewteen both location early might be a clue...