joseph103 的鑑定

Common Greenshank (Tringa nebularia) (in foreground of 2nd photo). 1 Common Greenshank (with the greenish legs) and 6 Greater Yellowlegs were foraging together in Twin Ponds (a vernal pool) at corner of Border Rd. and Addington Rd. in Fort Ord National Monument (no car access). Link to Greater Yellowlegs observation: https://www.inaturalist.org/observations/188944663

Irene's Ebird Checklist # S153118843 that includes this Common Greenshank (Tringa nebularia) : https://ebird.org/checklist/S153118843

Write-up about this Common Greenshank sighting in Don Roberson's quarterly Monterey County Highlights: 2023 (Rare Bird Sightings in Monterey County) Fall-Winter (October-December) newletter, 2023: (link pending)

Common Greenshank (Tringa nebularia) is large shorebird that is "common in Europe and Asia. There, it seems to fill the same niche as the Greater Yellowlegs in the U.S.; it is not too different in appearance, and it even sounds similar. Common Greenshanks show up in small numbers on the Alaskan islands, mostly during spring migration. It is a fairly large sandpiper, 30.5 cm (12 inches) long, similar to Greater Yellowlegs in size and shape, but tends to be grayer and less sharply marked, with green legs. In flight, it shows white triangle extending up back."

Audubon Guide to North American Birds https://www.audubon.org/field-guide/bird/common-greenshank

Common Greenshank is a "large wader with a slightly upturned bill. Note overall grayish plumage with white belly and greenish legs. In flight, appears dark above with a broad white stripe up the middle of the back. Slightly larger and lankier than Common Redshank. Usually seen as singles or small groups. Listen for mellow “tewtewtew.” Feeds mainly by striding in water, picking and sweeping with its bill. Breeds across northern Europe and Asia; migrants and wintering birds in Africa, southern Asia and Australia occur in varied wetland habitats."

Ebird with species description, range map and sound recordings: https://ebird.org/species/comgre/

Xeno-canto Bird songs, sound recordings, and species range map: https://xeno-canto.org/species/Tringa-nebularia

National Geographic Field Guide to the Birds of North America, ed. Jon L. Dunn, 7th ed., 2017 (species not listed)

Monterey Birds, Don Roberson, 2nd ed. 2002, sponsored by Monterey Peninsula Audubon Society (species not listed)

Irene's Sandpipers and Allies (Scolopacidae) family observations on INaturalist, worldwide:
https://www.inaturalist.org/observations?taxon_id=3835&user_id=aparrot1

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Merlin Bird ID: How to use/get the portable App (Bird ID help for 8,500+ species) https://merlin.allaboutbirds.org/

Found Feathers Resources (comprehensive list with links by INat featherenthusiast): https://foundfeathers.org/resources/
Found Feathers: INaturalist Project: https://www.inaturalist.org/projects/found-feathers
Found Feathers (worldwide) I.D. Tool: https://www.fws.gov/lab/featheratlas/idtool.php
Irene's Feather observations on INaturalist, worldwide: https://www.inaturalist.org/observations?project_id=125924&ttl=900&v=1725598515000&place_id=any&verifiable=any&subview=grid&user_id=3188668

Irene's Ebird Profile: https://ebird.org/profile/MTIwNjIzMg and my worldwide checklists: https://ebird.org/mychecklists

Irene's (aparrot1) Profile Page on INaturalist listing Nature Resources (includes list of online references with links) for Plants, Birds, Fungi, Lepidoptera, Arachnids, Reptiles, Amphibians, Marine Life, Plant Galls, and more: https://www.inaturalist.org/people/3188668

probably Pacific-slope, common in the region, but behavior, notably flicking tail, didn't ring true for this species. Note: a Least Flycatcher has been well-documented less than a mile away and a Willow a few miles south.

Those two individuals were identified as Herring Gull, but I have doubts if it could be another species in first winter plumage. Especially because of the dark spot on the eye, completely black bill, streaked breast, pale uppertail coverts and dark tail-band.