FIELD NOTES Doug Bell LOCATION: East Sano Island, mouth of Columbia DATE: JUNE 5, 1985 River (Baker Bay, WA), OREGON June 4- cont: dark (23:00 hrs) and went with flashlight to traps. Gulls flew up from colony , even though it's a dark, overcast night. Traps were empty when I arrived, though June 5, Since I'll be picked up at 15:00 by Les, I'm concentrating on trapping near camp (area just east of it) This is where I cought 018 bird. Set trap out on 3 egg nest. Both mates of this pair appear similar; wing tips slightly darker than mantle, red eye rings. Caught the female (019). Could not catch the mate. Set both traps out on other 3 egg nests. Birds of one nest did not go in, female sat next to trap and "incubated" next to nest. Caught a female (020). Mated to bird of same appearance: yellow eye-ring darker mantle and wing tips darker than mantle. Looks like a good "Western Gull". Took eggs of this pair (DRO 020 A-B-C). My general impression of this island colony is that it is very mixed in regards to gull types. Appears to be about 1/2 and 1/2: Western type and Glaucous-munged types. But it also seems as if every degree of variation in between can be found - birds with light grey backs = primaries, those with light mantles + dark, or black primaries, those with dark mantlos and black primaries. Very mixed up. Does not seem that the birds are mating assortively either.