One of our summer outings this year was to stay in an RV site right on the beach in Annacortes, WA. We delighted in watching the gulls have breakfast on the beach just after the tide went out.
It brought home my lack of knowledge about why there are so many different markings. Does each one have a different classification? It was clearly time to do some research!

Western Gull photo by Jeff Poklen Copyright 2005
The most important basic keys to identifying gulls are size, shape, and color pattern. The species you see will depend on where you are, of course, but sorting them by size and location first will leave only one or two common species.

Glaucous Winged Gull phoyo by Rtein Eynsue
In the Pacific Northwest, it’s probably a Western Gull, a Glaucous-winged Gull, or a Herring Gull. Pictured are mature ones. The Herring Gull can be found all across North America.
The Atlantic and Gulf coasts are blessed with the Laughing Gull considered a medium size.

GreatBlack-backedGull photo by Steven Wickstrom
The North Atlantic coast has the Great Black-backed Gull and it is the largest. Also called the California Gull and is common in Utah, their state bird. Now there is a story for a later blog!
Color pattern is very useful so pay attention to the body parts:
Back color: Pay close attention to the color of the mantle, or back.
Head pattern: Most gulls have white heads although Franklin and Bonaparte’s have a black hood.
Wing pattern: Most gulls have gray wings with dark tips but some have pale wings.
Leg color: Large gulls typically have pink legs and medium gulls usually have yellow legs. Small gulls can have black or red legs. The leg coloring can change with age, season and health of the gull.

GreatBlack-backedGull photo by Steven Wickstrom
“What about that smudgy brown and mottled one I saw on the beach?” you ask. Ah, yes, now we get to the difficult part of identifying gulls. Gulls change their coloring seemingly unceasingly as they mature from chicks to adults, which can take up to FOUR YEARS! Including the color of their legs! Most color descriptions are based on the breeding season. Some changes in coloring will occur during non-breeding. For a novice like myself, male and female markings are about the same.
So, if you know the most common gull along your beach and you are with friends for a stroll, you can confidently exclaim: “That one is a Glaucous-winged Gull (insert the one most common to your area) and that brownish one over there is an immature one. And the one over there is a non-breeding one!”
Photo Credits
Western Gull photo by Jeff Poklen click here to see his Seabird Photo site.
Glaucous Winged Gull phoyo by Rtein Eynsue from the blog Birdwatching by Wrwin, click here to see this blog.
Laughing Gull photo from Focus On Nature Tours, click here to see their website.
“The Seagull Who Was Afraid to Fly” is a book by Steven P. Wickstrom. Click here to check out his site to order the book and see the Great Black-back Gull photo and other gull photos and information.