Not sure between ring billed and herring... Both have a reference pic that looks just like this. It was with a flock of mostly ring-billed. The entire bill appears to be dark rather than having a ring.
Joke: Why do seagulls live by the sea? Because if they lived by the bay they would be bagels :-)
Western Gull (Larus occidentalis) Adults have a white head, dark gray back, pink legs/feet, and a large bill. Bill has a red or dark subterminal spot near end of lower bill that chicks peck in order to stimulate feeding. Distribution is limited to coastal saltwater habitat. The Western Gull is the only gull that nests along most of the Pacific Coast from Washington to the tip of Baja California. This large species is common at all seasons. An opportunist, it often nests around colonies of other seabirds, where it can steal unguarded eggs or chicks. It will also nest near colonies of California sea lions, scavenging any sea lion pups that die of natural causes.
Audubon Guide to North American Birds https://www.audubon.org/bird-guide and https://www.audubon.org/field-guide/bird/western-gull
National Geographic Field Guide to the Birds of Western North America, ed. Jon L. Dunn, 2008, pp. 178, 185.
Monterey Birds, Don Roberson, 2nd ed. 2002, sponsored by Monterey Peninsula Audubon Society, p. 230
Joke: Why do seagulls live by the sea? Because if they lived by the bay they would be bagels :-)
Western Gull (Larus occidentalis) Adults have a white head, dark gray back, pink legs/feet, and a large bill. Bill has a red or dark subterminal spot near end of lower bill that chicks peck in order to stimulate feeding. Distribution is limited to coastal saltwater habitat. The Western Gull is the only gull that nests along most of the Pacific Coast from Washington to the tip of Baja California. This large species is common at all seasons. An opportunist, it often nests around colonies of other seabirds, where it can steal unguarded eggs or chicks. It will also nest near colonies of California sea lions, scavenging any sea lion pups that die of natural causes.
Audubon Guide to North American Birds https://www.audubon.org/bird-guide and https://www.audubon.org/field-guide/bird/western-gull
National Geographic Field Guide to the Birds of North America, ed. Jon L. Dunn, 7th ed., 2017. pp.196-197
National Geographic Field Guide to the Birds of Western North America, ed. Jon L. Dunn, 2008, pp. 178, 185.
Monterey Birds, Don Roberson, 2nd ed. 2002, sponsored by Monterey Peninsula Audubon Society, p. 230
Sample sound recording of the Western Gull:
Sharing wildlife sounds from around the world https://xeno-canto.org/explore?query=Larus%20occidentalis
E Bird https://ebird.org/explore and https://ebird.org/species/wesgul/
Merlin Bird ID (great app available for Iphones) by The Cornell Lab (Bird ID help for 8,500+ species) https://merlin.allaboutbirds.org/
Found Feathers (Worldwide): https://www.fws.gov/lab/featheratlas/idtool.php