Heermann's Gull

Late last August, I saw my first Heerman's Gulls at South Jetty in Fort Stephens State Park. I commented on how they were mostly transitioned to non-breeding plumage.
During my Bandon trip on the 4th, I had my seconding sighting of a Heermann's Gull, but this time, being early July, it was still in breeding plumage.
Also, if you look closely, at the top image especially, you can see just how worn most of its feathers are and that it has a few new primary feathers. Primaries 6 - 9 are new with 6 not fully grown in. It also looks like the primary coverts above the new primaries are new. I'm not versed enough on mottling yet to know exactly if this part of breeding change or an aging rotation. Not even sure if that makes sense. :-)

Heermann's Gull

Another group of images from the South Jetty. These were some of the first birds I saw.
The top image is from the observation deck. At first I thought the group of dark Gulls in the middle were juveniles. I had never seen Heermann's Gulls before. It wasn't until I climbed down the jetty rocks to the shore and got in closer that I realized that these were some other species. That bright red bill didn't seem like a juvenile characteristic. I don't typically carry a field guide with me as my goal is to get as many photo opportunities as I can. I leave identifying until later at home on my computer.
These Heermann's have mostly transitioned to their non-breeding winter plumage as they have a white head during mating season. I sure appreciate the job Sibley has done in providing drawings of many of the juvenile and seasonal plumage changes. It makes identifying so much easier.