Baltic Type Gull

There has been a very large flock of Lesser Black backs around Brant Broughton all week , in excess of 1000, with a few Yellow legs scattered amongst them. I pulled in to scan through them last night and immediately noticed a small black one amongst them, I let out a few profanities as it took flight ! It was noticeably smaller than the Graellsii, with a very small ‘pigeon ‘ head, its mantle was as black as its wing tips with no discernible difference between the two, even in flight, a very very striking bird.