Species · accepted · checked 2026-08-05

Larus occidentalis

Western Gull

WoRMS 343916ITIS 176817key itis:176817

2026-08-05: worms_id 343916 via WoRMS TSN crosswalk (status accepted)

Silhouette · Sharon Wegner-Larsen · CC0 1.0 · PhyloPic, drawn from Larus argentatus

Western Gull68 cm

bongo net ring71 cm

max · sealifebase

Photograph of Larus occidentalis — Photo · Roberto Daniel Avila · CC BY 4.0 · inat

The western gull is a large white-headed gull that lives on the west coast of North America and the Pacific Ocean. The western gull ranges from British Columbia, Canada, to Baja California, Mexico.W CalCOFI holds 9,176 observations of it in 1 dataset between 1987 and 2022.R

9,176
observations: 9,176
records: 9,176
sampling events: 1987–2022
years: 1
datasets

Observed in
i
One row per dataset, one cell per year, darker with more observations — the same strip the front door draws per dataset. Each row ends with the name that dataset uses (dataset_taxon); the accepted name is written once, in the title above. A quiet pill marks a name the authority does not accept.

Seabirds & Marine Mammals 9,176 obs · 9,176 events · 1987–2022
name used: Larus occidentalis Western Gull · code WEGU

How big is it
i
Every mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.

Groups

calcofi:seabirds

Ways in
i
Read from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.

Explorer db-query

ERDDAPCalCOFI's own server, the Seabirds & Marine Mammals table constrained to this taxon

https://erddap.calcofi.io/erddap/tabledap/farallon_bird-mammal.html?&taxon_key=%22itis:176817%22

Larus occidentalis

How big is itiEvery mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.

Groups

Ways iniRead from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.

How big is it
i
Every mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.

Ways in
i
Read from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.